fix: ensure AI provider config is saved correctly in admin

URGENT FIX: Admin form was not properly saving AI provider configuration,
causing 'AI_PROVIDER_TAGS is not configured' error even after setting OpenAI.

Changes:
- admin-settings-form.tsx: Added validation and error handling
- admin-settings.ts: Filter empty values before saving to DB
- setup-openai.ts: Script to initialize OpenAI as default provider

This fixes the critical bug where users couldn't use the app after
configuring OpenAI in the admin interface.

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

keep-notes/app/actions/admin-settings.ts

@@ -39,16 +39,23 @@ export async function getSystemConfig() {
 
 export async function updateSystemConfig(data: Record<string, string>) {
   await checkAdmin()
-  
+
   try {
-    const operations = Object.entries(data).map(([key, value]) => 
+    // Filter out empty values but keep 'false' as valid
+    const filteredData = Object.fromEntries(
+      Object.entries(data).filter(([key, value]) => value !== '' && value !== null && value !== undefined)
+    )
+
+    console.log('Updating system config:', filteredData)
+
+    const operations = Object.entries(filteredData).map(([key, value]) =>
       prisma.systemConfig.upsert({
         where: { key },
         update: { value },
         create: { key, value }
       })
     )
-    
+
     await prisma.$transaction(operations)
     revalidatePath('/admin/settings')
     return { success: true }