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.

scripts/test-story-points.ts

@@ -13,7 +13,7 @@ async function testStoryPoints() {
   
   try {
     // Récupérer la config Jira
-    const jiraConfig = await userPreferencesService.getJiraConfig();
+    const jiraConfig = await userPreferencesService.getJiraConfig('default');
     
     if (!jiraConfig.enabled || !jiraConfig.baseUrl || !jiraConfig.email || !jiraConfig.apiToken) {
       console.log('❌ Configuration Jira manquante');