add ai descriptions and extracted text

src/app/api/ai-settings/route.ts

@@ -1,27 +1,28 @@
 import { NextRequest, NextResponse } from 'next/server'
 import { requireAdmin } from '@/lib/auth'
-import { getAiConfig, updateAiConfig } from '@/lib/app-settings'
+import { getAiConfig, updateAiConfig, getPreferredLanguage, setPreferredLanguage } from '@/lib/app-settings'
 
 export async function GET(request: NextRequest) {
   const auth = await requireAdmin(request)
   if (auth instanceof NextResponse) return auth
 
   const { endpoint, model, enabled } = getAiConfig()
-  return NextResponse.json({ endpoint, model, enabled })
+  const preferredLanguage = getPreferredLanguage()
+  return NextResponse.json({ endpoint, model, enabled, preferredLanguage })
 }
 
 export async function PUT(request: NextRequest) {
   const auth = await requireAdmin(request)
   if (auth instanceof NextResponse) return auth
 
-  let body: { endpoint?: string; model?: string; enabled?: boolean }
+  let body: { endpoint?: string; model?: string; enabled?: boolean; preferredLanguage?: string }
   try {
     body = await request.json()
   } catch {
     return NextResponse.json({ error: 'Invalid JSON body' }, { status: 400 })
   }
 
-  const { endpoint, model, enabled } = body
+  const { endpoint, model, enabled, preferredLanguage } = body
 
   if (typeof endpoint !== 'string') {
     return NextResponse.json({ error: 'endpoint is required' }, { status: 400 })
@@ -34,5 +35,10 @@ export async function PUT(request: NextRequest) {
   }
 
   updateAiConfig(endpoint, model, enabled)
-  return NextResponse.json({ endpoint, model, enabled })
+
+  if (typeof preferredLanguage === 'string' && preferredLanguage.trim()) {
+    setPreferredLanguage(preferredLanguage.trim())
+  }
+
+  return NextResponse.json({ endpoint, model, enabled, preferredLanguage: getPreferredLanguage() })
 }