feat: implement Jira auto-sync scheduler and UI configuration

- Added `jiraAutoSync` and `jiraSyncInterval` fields to user preferences for scheduler configuration.
- Created `JiraScheduler` service to manage automatic synchronization with Jira based on user settings.
- Updated API route to handle scheduler actions and configuration updates.
- Introduced `JiraSchedulerConfig` component for user interface to control scheduler settings.
- Enhanced `TODO.md` to reflect completed tasks related to Jira synchronization features.

prisma/schema.prisma

@@ -101,6 +101,10 @@ model UserPreferences {
   // Configuration Jira (JSON)
   jiraConfig Json?
   
+  // Configuration du scheduler Jira
+  jiraAutoSync Boolean @default(false)
+  jiraSyncInterval String @default("daily") // hourly, daily, weekly
+  
   createdAt DateTime @default(now())
   updatedAt DateTime @updatedAt