feat: 8 AI providers, rich text editor, agent notifications, UI contrast & font settings

- Add DeepSeek, OpenRouter, Mistral, Z.AI, LM Studio as AI providers
  with editable model names via Combobox in admin settings
- Fix OpenRouter broken by normalizeProvider bug in config.ts
- Convert agent-created notes from Markdown to HTML (TipTap rich text)
- Add Notification model + in-app notifications for agent results
- Agent notification click opens the created note directly
- Add note count display on notebook and inbox headers
- Fix checklist toggle in card view (persist state via localCheckItems)
- Add checklist creation option in tabs/list view (dropdown on + button)
- Fix image description ENOENT error with HTTP fallback
- Improve UI contrast across all themes (input, border, checkbox visibility)
- Add font family setting (Inter vs System Default) in Appearance settings
- Fix CSS font-sans variable conflict (removed dead Geist references)
- Update README with new features and 8 providers

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

memento-note/lib/config.ts

@@ -1,24 +1,32 @@
 import prisma from './prisma'
 
-// "openrouter" était une ancienne valeur de provider — on la normalise en "custom"
-function normalizeProvider(val: string | undefined): string {
-  if (!val) return ''
-  return val === 'openrouter' ? 'custom' : val
-}
-
 // Environment variable fallbacks for system config keys
 const ENV_FALLBACKS: Record<string, string> = {
-  // AI providers (openrouter → custom)
-  AI_PROVIDER_TAGS: normalizeProvider(process.env.AI_PROVIDER_TAGS),
+  // AI providers
+  AI_PROVIDER_TAGS: process.env.AI_PROVIDER_TAGS || '',
   AI_MODEL_TAGS: process.env.AI_MODEL_TAGS || '',
-  AI_PROVIDER_EMBEDDING: normalizeProvider(process.env.AI_PROVIDER_EMBEDDING),
+  AI_PROVIDER_EMBEDDING: process.env.AI_PROVIDER_EMBEDDING || '',
   AI_MODEL_EMBEDDING: process.env.AI_MODEL_EMBEDDING || '',
-  AI_PROVIDER_CHAT: normalizeProvider(process.env.AI_PROVIDER_CHAT),
+  AI_PROVIDER_CHAT: process.env.AI_PROVIDER_CHAT || '',
   AI_MODEL_CHAT: process.env.AI_MODEL_CHAT || '',
+  // Ollama
   OLLAMA_BASE_URL: process.env.OLLAMA_BASE_URL || '',
+  // OpenAI
   OPENAI_API_KEY: process.env.OPENAI_API_KEY || '',
+  // Custom OpenAI
   CUSTOM_OPENAI_API_KEY: process.env.CUSTOM_OPENAI_API_KEY || '',
   CUSTOM_OPENAI_BASE_URL: process.env.CUSTOM_OPENAI_BASE_URL || '',
+  // DeepSeek
+  DEEPSEEK_API_KEY: process.env.DEEPSEEK_API_KEY || '',
+  // OpenRouter
+  OPENROUTER_API_KEY: process.env.OPENROUTER_API_KEY || '',
+  // Mistral
+  MISTRAL_API_KEY: process.env.MISTRAL_API_KEY || '',
+  // Z.AI
+  ZAI_API_KEY: process.env.ZAI_API_KEY || '',
+  // LM Studio
+  LMSTUDIO_BASE_URL: process.env.LMSTUDIO_BASE_URL || '',
+  LMSTUDIO_API_KEY: process.env.LMSTUDIO_API_KEY || '',
   // Email
   EMAIL_PROVIDER: process.env.EMAIL_PROVIDER || (process.env.RESEND_API_KEY ? 'resend' : 'smtp'),
   RESEND_API_KEY: process.env.RESEND_API_KEY || '',
@@ -51,11 +59,6 @@ export async function getSystemConfig() {
     console.error('Failed to load system config from DB:', e)
   }
 
-  // Normalise les valeurs openrouter → custom dans la DB aussi
-  for (const key of ['AI_PROVIDER_TAGS', 'AI_PROVIDER_EMBEDDING', 'AI_PROVIDER_CHAT']) {
-    if (dbConfig[key] === 'openrouter') dbConfig[key] = 'custom'
-  }
-
   // Merge: DB values take precedence, env vars as fallback
   const merged = { ...ENV_FALLBACKS, ...dbConfig }
   return merged