feat: enhance user preferences management with userId integration

- Added `userId` field to `UserPreferences` model in Prisma schema for user-specific preferences.
- Implemented migration to populate existing preferences with the first user.
- Updated user preferences service methods to handle user-specific data retrieval and updates.
- Modified API routes and components to ensure user authentication and fetch preferences based on the authenticated user.
- Enhanced session management in various components to load user preferences accordingly.

src/components/settings/TfsConfigForm.tsx

@@ -34,7 +34,7 @@ export function TfsConfigForm() {
     try {
       setIsLoading(true);
       const result = await getTfsConfig();
-      if (result.success) {
+      if (result.success && result.data) {
         setConfig(result.data);
         // Afficher le formulaire par défaut si TFS n'est pas configuré
         const isConfigured =