feat: AI provider testing page + multi-provider support + UX design spec

- Add AI Provider Testing page (/admin/ai-test) with Tags and Embeddings tests
- Add new AI providers: CustomOpenAI, DeepSeek, OpenRouter
- Add API routes for AI config, models listing, and testing endpoints
- Add UX Design Specification document for Phase 1 MVP AI
- Add PRD Phase 1 MVP AI planning document
- Update admin settings and sidebar navigation
- Fix AI factory for multi-provider support

keep-notes/app/(main)/admin/ai-test/ai-tester.tsx

@@ -0,0 +1,258 @@
+'use client'
+
+import { Button } from '@/components/ui/button'
+import { Card, CardContent } from '@/components/ui/card'
+import { Badge } from '@/components/ui/badge'
+import { useState, useEffect } from 'react'
+import { toast } from 'sonner'
+import { Loader2, CheckCircle2, XCircle, Clock, Zap, Info } from 'lucide-react'
+
+interface TestResult {
+  success: boolean
+  provider?: string
+  model?: string
+  responseTime?: number
+  tags?: Array<{ tag: string; confidence: number }>
+  embeddingLength?: number
+  firstValues?: number[]
+  error?: string
+  details?: any
+}
+
+export function AI_TESTER({ type }: { type: 'tags' | 'embeddings' }) {
+  const [isLoading, setIsLoading] = useState(false)
+  const [result, setResult] = useState<TestResult | null>(null)
+  const [config, setConfig] = useState<any>(null)
+
+  useEffect(() => {
+    fetchConfig()
+  }, [])
+
+  const fetchConfig = async () => {
+    try {
+      const response = await fetch('/api/ai/config')
+      const data = await response.json()
+      setConfig(data)
+
+      // Set previous result if available
+      if (data.previousTest) {
+        setResult(data.previousTest[type] || null)
+      }
+    } catch (error) {
+      console.error('Failed to fetch config:', error)
+    }
+  }
+
+  const runTest = async () => {
+    setIsLoading(true)
+    const startTime = Date.now()
+
+    try {
+      const response = await fetch(`/api/ai/test-${type}`, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' }
+      })
+
+      const endTime = Date.now()
+      const data = await response.json()
+
+      setResult({
+        ...data,
+        responseTime: endTime - startTime
+      })
+
+      if (data.success) {
+        toast.success(
+          `✅ ${type === 'tags' ? 'Tags' : 'Embeddings'} Test Successful!`,
+          {
+            description: `Provider: ${data.provider} | Time: ${endTime - startTime}ms`
+          }
+        )
+      } else {
+        toast.error(
+          `❌ ${type === 'tags' ? 'Tags' : 'Embeddings'} Test Failed`,
+          {
+            description: data.error || 'Unknown error'
+          }
+        )
+      }
+    } catch (error: any) {
+      const endTime = Date.now()
+      const errorResult = {
+        success: false,
+        error: error.message || 'Network error',
+        responseTime: endTime - startTime
+      }
+      setResult(errorResult)
+      toast.error(`❌ Test Error: ${error.message}`)
+    } finally {
+      setIsLoading(false)
+    }
+  }
+
+  const getProviderInfo = () => {
+    if (!config) return { provider: 'Loading...', model: 'Loading...' }
+
+    if (type === 'tags') {
+      return {
+        provider: config.AI_PROVIDER_TAGS || 'ollama',
+        model: config.AI_MODEL_TAGS || 'granite4:latest'
+      }
+    } else {
+      return {
+        provider: config.AI_PROVIDER_EMBEDDING || 'ollama',
+        model: config.AI_MODEL_EMBEDDING || 'embeddinggemma:latest'
+      }
+    }
+  }
+
+  const providerInfo = getProviderInfo()
+
+  return (
+    <div className="space-y-4">
+      {/* Provider Info */}
+      <div className="space-y-3 p-4 bg-muted/50 rounded-lg">
+        <div className="flex items-center justify-between">
+          <span className="text-sm font-medium">Provider:</span>
+          <Badge variant="outline" className="text-xs">
+            {providerInfo.provider.toUpperCase()}
+          </Badge>
+        </div>
+        <div className="flex items-center justify-between">
+          <span className="text-sm font-medium">Model:</span>
+          <span className="text-sm text-muted-foreground font-mono">
+            {providerInfo.model}
+          </span>
+        </div>
+      </div>
+
+      {/* Test Button */}
+      <Button
+        onClick={runTest}
+        disabled={isLoading}
+        className="w-full"
+        variant={result?.success ? 'default' : result?.success === false ? 'destructive' : 'default'}
+      >
+        {isLoading ? (
+          <>
+            <Loader2 className="mr-2 h-4 w-4 animate-spin" />
+            Testing...
+          </>
+        ) : (
+          <>
+            <Zap className="mr-2 h-4 w-4" />
+            Run Test
+          </>
+        )}
+      </Button>
+
+      {/* Results */}
+      {result && (
+        <Card className={result.success ? 'border-green-200 dark:border-green-900' : 'border-red-200 dark:border-red-900'}>
+          <CardContent className="pt-6">
+            {/* Status */}
+            <div className="flex items-center gap-2 mb-4">
+              {result.success ? (
+                <>
+                  <CheckCircle2 className="h-5 w-5 text-green-600" />
+                  <span className="font-semibold text-green-600 dark:text-green-400">Test Passed</span>
+                </>
+              ) : (
+                <>
+                  <XCircle className="h-5 w-5 text-red-600" />
+                  <span className="font-semibold text-red-600 dark:text-red-400">Test Failed</span>
+                </>
+              )}
+            </div>
+
+            {/* Response Time */}
+            {result.responseTime && (
+              <div className="flex items-center gap-2 text-sm text-muted-foreground mb-4">
+                <Clock className="h-4 w-4" />
+                <span>Response time: {result.responseTime}ms</span>
+              </div>
+            )}
+
+            {/* Tags Results */}
+            {type === 'tags' && result.success && result.tags && (
+              <div className="space-y-3">
+                <div className="flex items-center gap-2">
+                  <Info className="h-4 w-4 text-blue-600" />
+                  <span className="text-sm font-medium">Generated Tags:</span>
+                </div>
+                <div className="flex flex-wrap gap-2">
+                  {result.tags.map((tag, idx) => (
+                    <Badge
+                      key={idx}
+                      variant="secondary"
+                      className="text-sm"
+                    >
+                      {tag.tag}
+                      <span className="ml-1 text-xs opacity-70">
+                        ({Math.round(tag.confidence * 100)}%)
+                      </span>
+                    </Badge>
+                  ))}
+                </div>
+              </div>
+            )}
+
+            {/* Embeddings Results */}
+            {type === 'embeddings' && result.success && result.embeddingLength && (
+              <div className="space-y-3">
+                <div className="flex items-center gap-2">
+                  <Info className="h-4 w-4 text-green-600" />
+                  <span className="text-sm font-medium">Embedding Dimensions:</span>
+                </div>
+                <div className="p-3 bg-muted rounded-lg">
+                  <div className="text-2xl font-bold text-center">
+                    {result.embeddingLength}
+                  </div>
+                  <div className="text-xs text-center text-muted-foreground mt-1">
+                    vector dimensions
+                  </div>
+                </div>
+                {result.firstValues && result.firstValues.length > 0 && (
+                  <div className="space-y-1">
+                    <span className="text-xs font-medium">First 5 values:</span>
+                    <div className="p-2 bg-muted rounded font-mono text-xs">
+                      [{result.firstValues.slice(0, 5).map((v, i) => v.toFixed(4)).join(', ')}]
+                    </div>
+                  </div>
+                )}
+              </div>
+            )}
+
+            {/* Error Details */}
+            {!result.success && result.error && (
+              <div className="mt-4 p-3 bg-red-50 dark:bg-red-950/20 rounded-lg border border-red-200 dark:border-red-900">
+                <p className="text-sm font-medium text-red-900 dark:text-red-100">Error:</p>
+                <p className="text-sm text-red-700 dark:text-red-300 mt-1">{result.error}</p>
+                {result.details && (
+                  <details className="mt-2">
+                    <summary className="text-xs cursor-pointer text-red-600 dark:text-red-400">
+                      Technical details
+                    </summary>
+                    <pre className="mt-2 text-xs overflow-auto p-2 bg-red-100 dark:bg-red-900/30 rounded">
+                      {JSON.stringify(result.details, null, 2)}
+                    </pre>
+                  </details>
+                )}
+              </div>
+            )}
+          </CardContent>
+        </Card>
+      )}
+
+      {/* Loading State */}
+      {isLoading && (
+        <div className="text-center py-4">
+          <Loader2 className="h-8 w-8 animate-spin mx-auto text-blue-600" />
+          <p className="text-sm text-muted-foreground mt-2">
+            Testing {type === 'tags' ? 'tags generation' : 'embeddings'}...
+          </p>
+        </div>
+      )}
+    </div>
+  )
+}

keep-notes/app/(main)/admin/ai-test/page.tsx

@@ -0,0 +1,106 @@
+import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card'
+import { Button } from '@/components/ui/button'
+import { auth } from '@/auth'
+import { redirect } from 'next/navigation'
+import Link from 'next/link'
+import { ArrowLeft, TestTube } from 'lucide-react'
+import { AI_TESTER } from './ai-tester'
+
+export default async function AITestPage() {
+  const session = await auth()
+
+  if ((session?.user as any)?.role !== 'ADMIN') {
+    redirect('/')
+  }
+
+  return (
+    <div className="container mx-auto py-10 px-4 max-w-6xl">
+      <div className="flex justify-between items-center mb-8">
+        <div className="flex items-center gap-3">
+          <Link href="/admin/settings">
+            <Button variant="outline" size="icon">
+              <ArrowLeft className="h-4 w-4" />
+            </Button>
+          </Link>
+          <div>
+            <h1 className="text-3xl font-bold flex items-center gap-2">
+              <TestTube className="h-8 w-8" />
+              AI Provider Testing
+            </h1>
+            <p className="text-muted-foreground mt-1">
+              Test your AI providers for tag generation and semantic search embeddings
+            </p>
+          </div>
+        </div>
+      </div>
+
+      <div className="grid gap-6 md:grid-cols-2">
+        {/* Tags Provider Test */}
+        <Card className="border-blue-200 dark:border-blue-900">
+          <CardHeader className="bg-blue-50/50 dark:bg-blue-950/20">
+            <CardTitle className="flex items-center gap-2">
+              <span className="text-2xl">🏷️</span>
+              Tags Generation Test
+            </CardTitle>
+            <CardDescription>
+              Test the AI provider responsible for automatic tag suggestions
+            </CardDescription>
+          </CardHeader>
+          <CardContent className="pt-6">
+            <AI_TESTER type="tags" />
+          </CardContent>
+        </Card>
+
+        {/* Embeddings Provider Test */}
+        <Card className="border-green-200 dark:border-green-900">
+          <CardHeader className="bg-green-50/50 dark:bg-green-950/20">
+            <CardTitle className="flex items-center gap-2">
+              <span className="text-2xl">🔍</span>
+              Embeddings Test
+            </CardTitle>
+            <CardDescription>
+              Test the AI provider responsible for semantic search embeddings
+            </CardDescription>
+          </CardHeader>
+          <CardContent className="pt-6">
+            <AI_TESTER type="embeddings" />
+          </CardContent>
+        </Card>
+      </div>
+
+      {/* Info Section */}
+      <Card className="mt-6">
+        <CardHeader>
+          <CardTitle>ℹ️ How Testing Works</CardTitle>
+        </CardHeader>
+        <CardContent className="space-y-4 text-sm">
+          <div>
+            <h4 className="font-semibold mb-2">🏷️ Tags Generation Test:</h4>
+            <ul className="list-disc list-inside space-y-1 text-muted-foreground">
+              <li>Sends a sample note to the AI provider</li>
+              <li>Requests 3-5 relevant tags based on the content</li>
+              <li>Displays the generated tags with confidence scores</li>
+              <li>Measures response time</li>
+            </ul>
+          </div>
+          <div>
+            <h4 className="font-semibold mb-2">🔍 Embeddings Test:</h4>
+            <ul className="list-disc list-inside space-y-1 text-muted-foreground">
+              <li>Sends a sample text to the embedding provider</li>
+              <li>Generates a vector representation (list of numbers)</li>
+              <li>Displays embedding dimensions and sample values</li>
+              <li>Verifies the vector is valid and properly formatted</li>
+            </ul>
+          </div>
+          <div className="bg-amber-50 dark:bg-amber-950/20 p-4 rounded-lg border border-amber-200 dark:border-amber-900">
+            <p className="font-semibold text-amber-900 dark:text-amber-100">💡 Tip:</p>
+            <p className="text-amber-800 dark:text-amber-200 mt-1">
+              You can use different providers for tags and embeddings! For example, use Ollama (free) for tags
+              and OpenAI (best quality) for embeddings to optimize costs and performance.
+            </p>
+          </div>
+        </CardContent>
+      </Card>
+    </div>
+  )
+}

keep-notes/app/(main)/admin/settings/admin-settings-form.tsx

@@ -4,36 +4,66 @@ import { Button } from '@/components/ui/button'
 import { Input } from '@/components/ui/input'
 import { Checkbox } from '@/components/ui/checkbox'
 import { Card, CardContent, CardDescription, CardFooter, CardHeader, CardTitle } from '@/components/ui/card'
+import { Label } from '@/components/ui/label'
 import { updateSystemConfig, testSMTP } from '@/app/actions/admin-settings'
 import { toast } from 'sonner'
 import { useState, useEffect } from 'react'
+import Link from 'next/link'
+import { TestTube, ExternalLink } from 'lucide-react'
+
+type AIProvider = 'ollama' | 'openai' | 'custom'
+
+interface AvailableModels {
+  tags: string[]
+  embeddings: string[]
+}
+
+const MODELS_2026 = {
+  ollama: {
+    tags: ['llama3:latest', 'llama3.2:latest', 'granite4:latest', 'mistral:latest', 'mixtral:latest', 'phi3:latest', 'gemma2:latest', 'qwen2:latest'],
+    embeddings: ['embeddinggemma:latest', 'mxbai-embed-large:latest', 'nomic-embed-text:latest']
+  },
+  openai: {
+    tags: ['gpt-4o', 'gpt-4o-mini', 'gpt-4-turbo', 'gpt-4', 'gpt-3.5-turbo'],
+    embeddings: ['text-embedding-3-small', 'text-embedding-3-large', 'text-embedding-ada-002']
+  },
+  custom: {
+    tags: ['gpt-4o-mini', 'gpt-4o', 'claude-3-haiku', 'claude-3-sonnet', 'llama-3.1-8b'],
+    embeddings: ['text-embedding-3-small', 'text-embedding-3-large', 'text-embedding-ada-002']
+  }
+}
 
 export function AdminSettingsForm({ config }: { config: Record<string, string> }) {
   const [isSaving, setIsSaving] = useState(false)
   const [isTesting, setIsTesting] = useState(false)
-  
+
   // Local state for Checkbox
   const [allowRegister, setAllowRegister] = useState(config.ALLOW_REGISTRATION !== 'false')
   const [smtpSecure, setSmtpSecure] = useState(config.SMTP_SECURE === 'true')
   const [smtpIgnoreCert, setSmtpIgnoreCert] = useState(config.SMTP_IGNORE_CERT === 'true')
 
+  // AI Provider state - separated for tags and embeddings
+  const [tagsProvider, setTagsProvider] = useState<AIProvider>((config.AI_PROVIDER_TAGS as AIProvider) || 'ollama')
+  const [embeddingsProvider, setEmbeddingsProvider] = useState<AIProvider>((config.AI_PROVIDER_EMBEDDING as AIProvider) || 'ollama')
+
   // Sync state with config when server revalidates
   useEffect(() => {
     setAllowRegister(config.ALLOW_REGISTRATION !== 'false')
     setSmtpSecure(config.SMTP_SECURE === 'true')
     setSmtpIgnoreCert(config.SMTP_IGNORE_CERT === 'true')
+    setTagsProvider((config.AI_PROVIDER_TAGS as AIProvider) || 'ollama')
+    setEmbeddingsProvider((config.AI_PROVIDER_EMBEDDING as AIProvider) || 'ollama')
   }, [config])
 
   const handleSaveSecurity = async (formData: FormData) => {
     setIsSaving(true)
-    // We override the formData get because the hidden input might be tricky
     const data = {
       ALLOW_REGISTRATION: allowRegister ? 'true' : 'false',
     }
-    
+
     const result = await updateSystemConfig(data)
     setIsSaving(false)
-    
+
     if (result.error) {
       toast.error('Failed to update security settings')
     } else {
@@ -43,20 +73,45 @@ export function AdminSettingsForm({ config }: { config: Record<string, string> }
 
   const handleSaveAI = async (formData: FormData) => {
     setIsSaving(true)
-    const data = {
-      AI_PROVIDER: formData.get('AI_PROVIDER') as string,
-      OLLAMA_BASE_URL: formData.get('OLLAMA_BASE_URL') as string,
-      AI_MODEL_EMBEDDING: formData.get('AI_MODEL_EMBEDDING') as string,
-      OPENAI_API_KEY: formData.get('OPENAI_API_KEY') as string,
+    const data: Record<string, string> = {}
+
+    // Tags provider configuration
+    const tagsProv = formData.get('AI_PROVIDER_TAGS') as AIProvider
+    data.AI_PROVIDER_TAGS = tagsProv
+    data.AI_MODEL_TAGS = formData.get('AI_MODEL_TAGS') as string
+
+    if (tagsProv === 'ollama') {
+      data.OLLAMA_BASE_URL = formData.get('OLLAMA_BASE_URL_TAGS') as string
+    } else if (tagsProv === 'openai') {
+      data.OPENAI_API_KEY = formData.get('OPENAI_API_KEY') as string
+    } else if (tagsProv === 'custom') {
+      data.CUSTOM_OPENAI_API_KEY = formData.get('CUSTOM_OPENAI_API_KEY_TAGS') as string
+      data.CUSTOM_OPENAI_BASE_URL = formData.get('CUSTOM_OPENAI_BASE_URL_TAGS') as string
     }
-    
+
+    // Embeddings provider configuration
+    const embedProv = formData.get('AI_PROVIDER_EMBEDDING') as AIProvider
+    data.AI_PROVIDER_EMBEDDING = embedProv
+    data.AI_MODEL_EMBEDDING = formData.get('AI_MODEL_EMBEDDING') as string
+
+    if (embedProv === 'ollama') {
+      data.OLLAMA_BASE_URL = formData.get('OLLAMA_BASE_URL_EMBEDDING') as string
+    } else if (embedProv === 'openai') {
+      data.OPENAI_API_KEY = formData.get('OPENAI_API_KEY') as string
+    } else if (embedProv === 'custom') {
+      data.CUSTOM_OPENAI_API_KEY = formData.get('CUSTOM_OPENAI_API_KEY_EMBEDDING') as string
+      data.CUSTOM_OPENAI_BASE_URL = formData.get('CUSTOM_OPENAI_BASE_URL_EMBEDDING') as string
+    }
+
     const result = await updateSystemConfig(data)
     setIsSaving(false)
-    
+
     if (result.error) {
       toast.error('Failed to update AI settings')
     } else {
       toast.success('AI Settings updated')
+      setTagsProvider(tagsProv)
+      setEmbeddingsProvider(embedProv)
     }
   }
 
@@ -71,10 +126,10 @@ export function AdminSettingsForm({ config }: { config: Record<string, string> }
       SMTP_IGNORE_CERT: smtpIgnoreCert ? 'true' : 'false',
       SMTP_SECURE: smtpSecure ? 'true' : 'false',
     }
-    
+
     const result = await updateSystemConfig(data)
     setIsSaving(false)
-    
+
     if (result.error) {
       toast.error('Failed to update SMTP settings')
     } else {
@@ -108,8 +163,8 @@ export function AdminSettingsForm({ config }: { config: Record<string, string> }
         <form action={handleSaveSecurity}>
           <CardContent className="space-y-4">
             <div className="flex items-center space-x-2">
-              <Checkbox 
-                id="ALLOW_REGISTRATION" 
+              <Checkbox
+                id="ALLOW_REGISTRATION"
                 checked={allowRegister}
                 onCheckedChange={(c) => setAllowRegister(!!c)}
               />
@@ -133,40 +188,219 @@ export function AdminSettingsForm({ config }: { config: Record<string, string> }
       <Card>
         <CardHeader>
           <CardTitle>AI Configuration</CardTitle>
-          <CardDescription>Configure the AI provider for auto-tagging and semantic search.</CardDescription>
+          <CardDescription>Configure AI providers for auto-tagging and semantic search. Use different providers for optimal performance.</CardDescription>
         </CardHeader>
         <form action={handleSaveAI}>
-          <CardContent className="space-y-4">
-            <div className="space-y-2">
-              <label htmlFor="AI_PROVIDER" className="text-sm font-medium">Provider</label>
-              <select 
-                id="AI_PROVIDER" 
-                name="AI_PROVIDER" 
-                defaultValue={config.AI_PROVIDER || 'ollama'}
-                className="flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2"
-              >
-                <option value="ollama">Ollama (Local)</option>
-                <option value="openai">OpenAI</option>
-              </select>
-            </div>
-            
-            <div className="space-y-2">
-              <label htmlFor="OLLAMA_BASE_URL" className="text-sm font-medium">Ollama Base URL</label>
-              <Input id="OLLAMA_BASE_URL" name="OLLAMA_BASE_URL" defaultValue={config.OLLAMA_BASE_URL || 'http://localhost:11434'} placeholder="http://localhost:11434" />
+          <CardContent className="space-y-6">
+            {/* Tags Generation Section */}
+            <div className="space-y-4 p-4 border rounded-lg bg-blue-50/50 dark:bg-blue-950/20">
+              <h3 className="text-base font-semibold flex items-center gap-2">
+                <span className="text-blue-600">🏷️</span> Tags Generation Provider
+              </h3>
+              <p className="text-xs text-muted-foreground">AI provider for automatic tag suggestions. Recommended: Ollama (free, local).</p>
+
+              <div className="space-y-2">
+                <Label htmlFor="AI_PROVIDER_TAGS">Provider</Label>
+                <select
+                  id="AI_PROVIDER_TAGS"
+                  name="AI_PROVIDER_TAGS"
+                  value={tagsProvider}
+                  onChange={(e) => setTagsProvider(e.target.value as AIProvider)}
+                  className="flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2"
+                >
+                  <option value="ollama">🦙 Ollama (Local & Free)</option>
+                  <option value="openai">🤖 OpenAI (GPT-5, GPT-4)</option>
+                  <option value="custom">🔧 Custom OpenAI-Compatible</option>
+                </select>
+              </div>
+
+              {/* Ollama Tags Config */}
+              {tagsProvider === 'ollama' && (
+                <div className="space-y-3">
+                  <div className="space-y-2">
+                    <Label htmlFor="OLLAMA_BASE_URL_TAGS">Base URL</Label>
+                    <Input id="OLLAMA_BASE_URL_TAGS" name="OLLAMA_BASE_URL_TAGS" defaultValue={config.OLLAMA_BASE_URL || 'http://localhost:11434'} placeholder="http://localhost:11434" />
+                  </div>
+                  <div className="space-y-2">
+                    <Label htmlFor="AI_MODEL_TAGS_OLLAMA">Model</Label>
+                    <select
+                      id="AI_MODEL_TAGS_OLLAMA"
+                      name="AI_MODEL_TAGS"
+                      defaultValue={config.AI_MODEL_TAGS || 'granite4:latest'}
+                      className="flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2"
+                    >
+                      {MODELS_2026.ollama.tags.map((model) => (
+                        <option key={model} value={model}>{model}</option>
+                      ))}
+                    </select>
+                    <p className="text-xs text-muted-foreground">Select an Ollama model installed on your system</p>
+                  </div>
+                </div>
+              )}
+
+              {/* OpenAI Tags Config */}
+              {tagsProvider === 'openai' && (
+                <div className="space-y-3">
+                  <div className="space-y-2">
+                    <Label htmlFor="OPENAI_API_KEY">API Key</Label>
+                    <Input id="OPENAI_API_KEY" name="OPENAI_API_KEY" type="password" defaultValue={config.OPENAI_API_KEY || ''} placeholder="sk-..." />
+                    <p className="text-xs text-muted-foreground">Your OpenAI API key from <a href="https://platform.openai.com/api-keys" target="_blank" rel="noopener noreferrer" className="text-blue-500 hover:underline">platform.openai.com</a></p>
+                  </div>
+                  <div className="space-y-2">
+                    <Label htmlFor="AI_MODEL_TAGS_OPENAI">Model</Label>
+                    <select
+                      id="AI_MODEL_TAGS_OPENAI"
+                      name="AI_MODEL_TAGS"
+                      defaultValue={config.AI_MODEL_TAGS || 'gpt-4o-mini'}
+                      className="flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2"
+                    >
+                      {MODELS_2026.openai.tags.map((model) => (
+                        <option key={model} value={model}>{model}</option>
+                      ))}
+                    </select>
+                    <p className="text-xs text-muted-foreground"><strong className="text-green-600">gpt-4o-mini</strong> = Best value • <strong className="text-blue-600">gpt-4o</strong> = Best quality</p>
+                  </div>
+                </div>
+              )}
+
+              {/* Custom OpenAI Tags Config */}
+              {tagsProvider === 'custom' && (
+                <div className="space-y-3">
+                  <div className="space-y-2">
+                    <Label htmlFor="CUSTOM_OPENAI_BASE_URL_TAGS">Base URL</Label>
+                    <Input id="CUSTOM_OPENAI_BASE_URL_TAGS" name="CUSTOM_OPENAI_BASE_URL_TAGS" defaultValue={config.CUSTOM_OPENAI_BASE_URL || ''} placeholder="https://api.example.com/v1" />
+                  </div>
+                  <div className="space-y-2">
+                    <Label htmlFor="CUSTOM_OPENAI_API_KEY_TAGS">API Key</Label>
+                    <Input id="CUSTOM_OPENAI_API_KEY_TAGS" name="CUSTOM_OPENAI_API_KEY_TAGS" type="password" defaultValue={config.CUSTOM_OPENAI_API_KEY || ''} placeholder="sk-..." />
+                  </div>
+                  <div className="space-y-2">
+                    <Label htmlFor="AI_MODEL_TAGS_CUSTOM">Model</Label>
+                    <select
+                      id="AI_MODEL_TAGS_CUSTOM"
+                      name="AI_MODEL_TAGS"
+                      defaultValue={config.AI_MODEL_TAGS || 'gpt-4o-mini'}
+                      className="flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2"
+                    >
+                      {MODELS_2026.custom.tags.map((model) => (
+                        <option key={model} value={model}>{model}</option>
+                      ))}
+                    </select>
+                    <p className="text-xs text-muted-foreground">Common models for OpenAI-compatible APIs</p>
+                  </div>
+                </div>
+              )}
             </div>
 
-            <div className="space-y-2">
-              <label htmlFor="AI_MODEL_EMBEDDING" className="text-sm font-medium">Embedding Model</label>
-              <Input id="AI_MODEL_EMBEDDING" name="AI_MODEL_EMBEDDING" defaultValue={config.AI_MODEL_EMBEDDING || 'embeddinggemma:latest'} placeholder="embeddinggemma:latest" />
-            </div>
+            {/* Embeddings Section */}
+            <div className="space-y-4 p-4 border rounded-lg bg-green-50/50 dark:bg-green-950/20">
+              <h3 className="text-base font-semibold flex items-center gap-2">
+                <span className="text-green-600">🔍</span> Embeddings Provider
+              </h3>
+              <p className="text-xs text-muted-foreground">AI provider for semantic search embeddings. Recommended: OpenAI (best quality).</p>
 
-            <div className="space-y-2">
-              <label htmlFor="OPENAI_API_KEY" className="text-sm font-medium">OpenAI API Key (if using OpenAI)</label>
-              <Input id="OPENAI_API_KEY" name="OPENAI_API_KEY" type="password" defaultValue={config.OPENAI_API_KEY || ''} placeholder="sk-..." />
+              <div className="space-y-2">
+                <Label htmlFor="AI_PROVIDER_EMBEDDING">Provider</Label>
+                <select
+                  id="AI_PROVIDER_EMBEDDING"
+                  name="AI_PROVIDER_EMBEDDING"
+                  value={embeddingsProvider}
+                  onChange={(e) => setEmbeddingsProvider(e.target.value as AIProvider)}
+                  className="flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2"
+                >
+                  <option value="ollama">🦙 Ollama (Local & Free)</option>
+                  <option value="openai">🤖 OpenAI (text-embedding-4)</option>
+                  <option value="custom">🔧 Custom OpenAI-Compatible</option>
+                </select>
+              </div>
+
+              {/* Ollama Embeddings Config */}
+              {embeddingsProvider === 'ollama' && (
+                <div className="space-y-3">
+                  <div className="space-y-2">
+                    <Label htmlFor="OLLAMA_BASE_URL_EMBEDDING">Base URL</Label>
+                    <Input id="OLLAMA_BASE_URL_EMBEDDING" name="OLLAMA_BASE_URL_EMBEDDING" defaultValue={config.OLLAMA_BASE_URL || 'http://localhost:11434'} placeholder="http://localhost:11434" />
+                  </div>
+                  <div className="space-y-2">
+                    <Label htmlFor="AI_MODEL_EMBEDDING_OLLAMA">Model</Label>
+                    <select
+                      id="AI_MODEL_EMBEDDING_OLLAMA"
+                      name="AI_MODEL_EMBEDDING"
+                      defaultValue={config.AI_MODEL_EMBEDDING || 'embeddinggemma:latest'}
+                      className="flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2"
+                    >
+                      {MODELS_2026.ollama.embeddings.map((model) => (
+                        <option key={model} value={model}>{model}</option>
+                      ))}
+                    </select>
+                    <p className="text-xs text-muted-foreground">Select an embedding model installed on your system</p>
+                  </div>
+                </div>
+              )}
+
+              {/* OpenAI Embeddings Config */}
+              {embeddingsProvider === 'openai' && (
+                <div className="space-y-3">
+                  <div className="space-y-2">
+                    <Label htmlFor="OPENAI_API_KEY">API Key</Label>
+                    <Input id="OPENAI_API_KEY" name="OPENAI_API_KEY" type="password" defaultValue={config.OPENAI_API_KEY || ''} placeholder="sk-..." />
+                    <p className="text-xs text-muted-foreground">Your OpenAI API key from <a href="https://platform.openai.com/api-keys" target="_blank" rel="noopener noreferrer" className="text-blue-500 hover:underline">platform.openai.com</a></p>
+                  </div>
+                  <div className="space-y-2">
+                    <Label htmlFor="AI_MODEL_EMBEDDING_OPENAI">Model</Label>
+                    <select
+                      id="AI_MODEL_EMBEDDING_OPENAI"
+                      name="AI_MODEL_EMBEDDING"
+                      defaultValue={config.AI_MODEL_EMBEDDING || 'text-embedding-3-small'}
+                      className="flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2"
+                    >
+                      {MODELS_2026.openai.embeddings.map((model) => (
+                        <option key={model} value={model}>{model}</option>
+                      ))}
+                    </select>
+                    <p className="text-xs text-muted-foreground"><strong className="text-green-600">text-embedding-3-small</strong> = Best value • <strong className="text-blue-600">text-embedding-3-large</strong> = Best quality</p>
+                  </div>
+                </div>
+              )}
+
+              {/* Custom OpenAI Embeddings Config */}
+              {embeddingsProvider === 'custom' && (
+                <div className="space-y-3">
+                  <div className="space-y-2">
+                    <Label htmlFor="CUSTOM_OPENAI_BASE_URL_EMBEDDING">Base URL</Label>
+                    <Input id="CUSTOM_OPENAI_BASE_URL_EMBEDDING" name="CUSTOM_OPENAI_BASE_URL_EMBEDDING" defaultValue={config.CUSTOM_OPENAI_BASE_URL || ''} placeholder="https://api.example.com/v1" />
+                  </div>
+                  <div className="space-y-2">
+                    <Label htmlFor="CUSTOM_OPENAI_API_KEY_EMBEDDING">API Key</Label>
+                    <Input id="CUSTOM_OPENAI_API_KEY_EMBEDDING" name="CUSTOM_OPENAI_API_KEY_EMBEDDING" type="password" defaultValue={config.CUSTOM_OPENAI_API_KEY || ''} placeholder="sk-..." />
+                  </div>
+                  <div className="space-y-2">
+                    <Label htmlFor="AI_MODEL_EMBEDDING_CUSTOM">Model</Label>
+                    <select
+                      id="AI_MODEL_EMBEDDING_CUSTOM"
+                      name="AI_MODEL_EMBEDDING"
+                      defaultValue={config.AI_MODEL_EMBEDDING || 'text-embedding-3-small'}
+                      className="flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2"
+                    >
+                      {MODELS_2026.custom.embeddings.map((model) => (
+                        <option key={model} value={model}>{model}</option>
+                      ))}
+                    </select>
+                    <p className="text-xs text-muted-foreground">Common embedding models for OpenAI-compatible APIs</p>
+                  </div>
+                </div>
+              )}
             </div>
           </CardContent>
-          <CardFooter>
-            <Button type="submit" disabled={isSaving}>Save AI Settings</Button>
+          <CardFooter className="flex justify-between">
+            <Button type="submit" disabled={isSaving}>{isSaving ? 'Saving...' : 'Save AI Settings'}</Button>
+            <Link href="/admin/ai-test">
+              <Button type="button" variant="outline" className="gap-2">
+                <TestTube className="h-4 w-4" />
+                Open AI Test Panel
+                <ExternalLink className="h-3 w-3" />
+              </Button>
+            </Link>
           </CardFooter>
         </form>
       </Card>
@@ -188,12 +422,12 @@ export function AdminSettingsForm({ config }: { config: Record<string, string> }
                 <Input id="SMTP_PORT" name="SMTP_PORT" defaultValue={config.SMTP_PORT || '587'} placeholder="587" />
               </div>
             </div>
-            
+
             <div className="space-y-2">
               <label htmlFor="SMTP_USER" className="text-sm font-medium">Username</label>
               <Input id="SMTP_USER" name="SMTP_USER" defaultValue={config.SMTP_USER || ''} />
             </div>
-            
+
             <div className="space-y-2">
               <label htmlFor="SMTP_PASS" className="text-sm font-medium">Password</label>
               <Input id="SMTP_PASS" name="SMTP_PASS" type="password" defaultValue={config.SMTP_PASS || ''} />
@@ -205,10 +439,10 @@ export function AdminSettingsForm({ config }: { config: Record<string, string> }
             </div>
 
             <div className="flex items-center space-x-2">
-              <Checkbox 
-                id="SMTP_SECURE" 
-                checked={smtpSecure} 
-                onCheckedChange={(c) => setSmtpSecure(!!c)} 
+              <Checkbox
+                id="SMTP_SECURE"
+                checked={smtpSecure}
+                onCheckedChange={(c) => setSmtpSecure(!!c)}
               />
               <label
                 htmlFor="SMTP_SECURE"
@@ -219,8 +453,8 @@ export function AdminSettingsForm({ config }: { config: Record<string, string> }
             </div>
 
             <div className="flex items-center space-x-2">
-              <Checkbox 
-                id="SMTP_IGNORE_CERT" 
+              <Checkbox
+                id="SMTP_IGNORE_CERT"
                 checked={smtpIgnoreCert}
                 onCheckedChange={(c) => setSmtpIgnoreCert(!!c)}
               />