feat: complete Phase 5 of service refactoring

- Marked tasks in `TODO.md` as completed for moving TFS and Jira services to the `integrations` directory and correcting imports across the codebase.
- Updated imports in various action files, API routes, and components to reflect the new structure.
- Removed obsolete `jira-advanced-filters.ts`, `jira-analytics.ts`, `jira-analytics-cache.ts`, `jira-anomaly-detection.ts`, `jira-scheduler.ts`, `jira.ts`, and `tfs.ts` files to streamline the codebase.
- Added new tasks in `TODO.md` for future cleaning and organization of service imports.

src/components/settings/IntegrationsSettingsPageClient.tsx

@@ -1,7 +1,7 @@
 'use client';
 
 import { JiraConfig } from '@/lib/types';
-import { TfsConfig } from '@/services/tfs';
+import { TfsConfig } from '@/services/integrations/tfs';
 import { Header } from '@/components/ui/Header';
 import { Card, CardHeader, CardContent } from '@/components/ui/Card';
 import { JiraConfigForm } from '@/components/settings/JiraConfigForm';

src/components/settings/TfsConfigForm.tsx

@@ -1,7 +1,7 @@
 'use client';
 
 import { useState, useEffect, useTransition } from 'react';
-import { TfsConfig } from '@/services/tfs';
+import { TfsConfig } from '@/services/integrations/tfs';
 import { getTfsConfig, saveTfsConfig, deleteAllTfsTasks } from '@/actions/tfs';
 import { Button } from '@/components/ui/Button';
 import { Badge } from '@/components/ui/Badge';