refactor: remove deprecated weekly summary components and related services

- Deleted `WeeklySummaryClient`, `VelocityMetrics`, `PeriodSelector`, and associated services to streamline the codebase.
- Removed the `weekly-summary` API route and related PDF export functionality, as these features are no longer in use.
- Updated `TODO.md` to reflect the removal of these components and their functionalities.

src/app/api/weekly-summary/route.ts

@@ -1,36 +0,0 @@
-import { NextRequest, NextResponse } from 'next/server';
-import { WeeklySummaryService } from '@/services/weekly-summary';
-
-export async function GET(request: NextRequest) {
-  try {
-    const { searchParams } = new URL(request.url);
-    const periodParam = searchParams.get('period');
-    
-    // Valider le paramètre de période
-    let periodDays = 7; // Défaut: 7 jours
-    if (periodParam) {
-      const parsedPeriod = parseInt(periodParam, 10);
-      if (!isNaN(parsedPeriod) && parsedPeriod > 0 && parsedPeriod <= 365) {
-        periodDays = parsedPeriod;
-      }
-    }
-
-    console.log(`📊 API weekly-summary appelée avec période: ${periodDays} jours`);
-
-    const summary = await WeeklySummaryService.getWeeklySummary(periodDays);
-    
-    return NextResponse.json(summary, {
-      headers: {
-        'Cache-Control': 'no-cache, no-store, must-revalidate',
-        'Pragma': 'no-cache',
-        'Expires': '0'
-      }
-    });
-  } catch (error) {
-    console.error('Erreur lors de la génération du résumé hebdomadaire:', error);
-    return NextResponse.json(
-      { error: 'Erreur lors de la génération du résumé' },
-      { status: 500 }
-    );
-  }
-}

src/app/weekly-summary/page.tsx

@@ -1,20 +0,0 @@
-import { Header } from '@/components/ui/Header';
-import WeeklySummaryClient from '@/components/dashboard/WeeklySummaryClient';
-import { WeeklySummaryService } from '@/services/weekly-summary';
-
-export default async function WeeklySummaryPage() {
-  // Récupération côté serveur
-  const summary = await WeeklySummaryService.getWeeklySummary();
-
-  return (
-    <div className="min-h-screen bg-[var(--background)]">
-      <Header />
-      
-      <div className="container mx-auto px-4 py-8">
-        <div className="max-w-6xl mx-auto">
-          <WeeklySummaryClient initialSummary={summary} />
-        </div>
-      </div>
-    </div>
-  );
-}