feat(ai): localize AI features

keep-notes/app/api/ai/batch-organize/route.ts

@@ -16,9 +16,25 @@ export async function POST(request: NextRequest) {
       )
     }
 
+    // Get language from request headers or body
+    let language = 'en'
+    try {
+      const body = await request.json()
+      if (body.language) {
+        language = body.language
+      }
+    } catch (e) {
+      // If no body or invalid json, check headers
+      const acceptLanguage = request.headers.get('accept-language')
+      if (acceptLanguage) {
+        language = acceptLanguage.split(',')[0].split('-')[0]
+      }
+    }
+
     // Create organization plan
     const plan = await batchOrganizationService.createOrganizationPlan(
-      session.user.id
+      session.user.id,
+      language
     )
 
     return NextResponse.json({