feat(ai): localize AI features

keep-notes/app/api/ai/auto-labels/route.ts

@@ -17,7 +17,7 @@ export async function POST(request: NextRequest) {
     }
 
     const body = await request.json()
-    const { notebookId } = body
+    const { notebookId, language = 'en' } = body
 
     if (!notebookId || typeof notebookId !== 'string') {
       return NextResponse.json(
@@ -45,7 +45,8 @@ export async function POST(request: NextRequest) {
     // Get label suggestions
     const suggestions = await autoLabelCreationService.suggestLabels(
       notebookId,
-      session.user.id
+      session.user.id,
+      language
     )
 
     if (!suggestions) {

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({

keep-notes/app/api/ai/notebook-summary/route.ts

@@ -17,7 +17,7 @@ export async function POST(request: NextRequest) {
     }
 
     const body = await request.json()
-    const { notebookId } = body
+    const { notebookId, language = 'en' } = body
 
     if (!notebookId || typeof notebookId !== 'string') {
       return NextResponse.json(
@@ -45,7 +45,8 @@ export async function POST(request: NextRequest) {
     // Generate summary
     const summary = await notebookSummaryService.generateSummary(
       notebookId,
-      session.user.id
+      session.user.id,
+      language
     )
 
     if (!summary) {

keep-notes/app/api/ai/suggest-notebook/route.ts

@@ -10,7 +10,7 @@ export async function POST(req: NextRequest) {
     }
 
     const body = await req.json()
-    const { noteContent } = body
+    const { noteContent, language = 'en' } = body
 
     if (!noteContent || typeof noteContent !== 'string') {
       return NextResponse.json({ error: 'noteContent is required' }, { status: 400 })
@@ -29,7 +29,8 @@ export async function POST(req: NextRequest) {
     // Get suggestion from AI service
     const suggestedNotebook = await notebookSuggestionService.suggestNotebook(
       noteContent,
-      session.user.id
+      session.user.id,
+      language
     )
 
     return NextResponse.json({

keep-notes/app/api/ai/tags/route.ts

@@ -8,6 +8,7 @@ import { z } from 'zod';
 const requestSchema = z.object({
   content: z.string().min(1, "Le contenu ne peut pas être vide"),
   notebookId: z.string().optional(),
+  language: z.string().default('en'),
 });
 
 export async function POST(req: NextRequest) {
@@ -18,14 +19,15 @@ export async function POST(req: NextRequest) {
     }
 
     const body = await req.json();
-    const { content, notebookId } = requestSchema.parse(body);
+    const { content, notebookId, language } = requestSchema.parse(body);
 
     // If notebookId is provided, use contextual suggestions (IA2)
     if (notebookId) {
       const suggestions = await contextualAutoTagService.suggestLabels(
         content,
         notebookId,
-        session.user.id
+        session.user.id,
+        language
       );
 
       // Convert label → tag to match TagSuggestion interface
@@ -37,7 +39,7 @@ export async function POST(req: NextRequest) {
         ...(s.isNewLabel !== undefined && { isNewLabel: s.isNewLabel })
       }));
 
-            return NextResponse.json({ tags: convertedTags });
+      return NextResponse.json({ tags: convertedTags });
     }
 
     // Otherwise, use legacy auto-tagging (generates new tags)