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';

src/components/dashboard/ProductivityAnalytics.tsx

@@ -1,7 +1,7 @@
 'use client';
 
 import { useState, useEffect, useTransition } from 'react';
-import { ProductivityMetrics } from '@/services/analytics';
+import { ProductivityMetrics } from '@/services/analytics/analytics';
 import { getProductivityMetrics } from '@/actions/analytics';
 import { CompletionTrendChart } from '@/components/charts/CompletionTrendChart';
 import { VelocityChart } from '@/components/charts/VelocityChart';

src/components/dashboard/charts/CompletionRateChart.tsx

@@ -1,7 +1,7 @@
 'use client';
 
 import { LineChart, Line, XAxis, YAxis, CartesianGrid, Tooltip, ResponsiveContainer } from 'recharts';
-import { DailyMetrics } from '@/services/metrics';
+import { DailyMetrics } from '@/services/analytics/metrics';
 import { parseDate, formatDateShort } from '@/lib/date-utils';
 
 interface CompletionRateChartProps {

src/components/dashboard/charts/DailyStatusChart.tsx

@@ -1,7 +1,7 @@
 'use client';
 
 import { BarChart, Bar, XAxis, YAxis, CartesianGrid, Tooltip, ResponsiveContainer, Legend } from 'recharts';
-import { DailyMetrics } from '@/services/metrics';
+import { DailyMetrics } from '@/services/analytics/metrics';
 import { parseDate, formatDateShort } from '@/lib/date-utils';
 
 interface DailyStatusChartProps {

src/components/dashboard/charts/ProductivityInsights.tsx

@@ -1,6 +1,6 @@
 'use client';
 
-import { DailyMetrics } from '@/services/metrics';
+import { DailyMetrics } from '@/services/analytics/metrics';
 
 interface ProductivityInsightsProps {
   data: DailyMetrics[];

src/components/dashboard/charts/VelocityTrendChart.tsx

@@ -1,7 +1,7 @@
 'use client';
 
 import { LineChart, Line, XAxis, YAxis, CartesianGrid, Tooltip, ResponsiveContainer, Legend } from 'recharts';
-import { VelocityTrend } from '@/services/metrics';
+import { VelocityTrend } from '@/services/analytics/metrics';
 
 interface VelocityTrendChartProps {
   data: VelocityTrend[];

src/components/dashboard/charts/WeeklyActivityHeatmap.tsx

@@ -1,6 +1,6 @@
 'use client';
 
-import { DailyMetrics } from '@/services/metrics';
+import { DailyMetrics } from '@/services/analytics/metrics';
 import { parseDate, isToday } from '@/lib/date-utils';
 
 interface WeeklyActivityHeatmapProps {