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.

src/components/settings/IntegrationsSettingsPageClient.tsx

@@ -6,6 +6,7 @@ import { Card, CardHeader, CardContent } from '@/components/ui/Card';
 import { JiraConfigForm } from '@/components/settings/JiraConfigForm';
 import { JiraSync } from '@/components/jira/JiraSync';
 import { JiraLogs } from '@/components/jira/JiraLogs';
+import { JiraSchedulerConfig } from '@/components/jira/JiraSchedulerConfig';
 import { UserPreferencesProvider } from '@/contexts/UserPreferencesContext';
 import Link from 'next/link';
 
@@ -145,6 +146,7 @@ export function IntegrationsSettingsPageClient({
                       </Card>
                     )}
                     
+                    <JiraSchedulerConfig />
                     <JiraSync />
                     <JiraLogs />
                   </>