feat: complete Phase 2 of service refactoring

- Marked tasks in `TODO.md` as completed for moving analytics-related files to the `analytics` directory and correcting imports across the codebase.
- Updated imports in `src/actions/analytics.ts`, `src/actions/metrics.ts`, and various components to reflect the new structure.
- Removed unused `analytics.ts`, `manager-summary.ts`, and `metrics.ts` files to streamline the codebase.

src/components/dashboard/ManagerWeeklySummary.tsx

@@ -1,7 +1,7 @@
 'use client';
 
 import { useState } from 'react';
-import { ManagerSummary } from '@/services/manager-summary';
+import { ManagerSummary } from '@/services/analytics/manager-summary';
 import { Card, CardHeader, CardContent } from '@/components/ui/Card';
 import { Button } from '@/components/ui/Button';
 import { TagDisplay } from '@/components/ui/TagDisplay';