Update dashboard to display yearly delivery statistics

Introduce a new API endpoint '/api/stats/yearly' for fetching annual statistics and update the StatsPanel component to use this endpoint, changing the card title to "Statistiques de l'année" and the average delivery time label to "Délai commande → livraison".

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: cfbfe47c-0c9a-4ebf-8a41-2937407eccff
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/1957c339-2757-4d1f-8e92-e9f71a1ce58e/cfbfe47c-0c9a-4ebf-8a41-2937407eccff/9qfOTfC

server/routes.ts

@@ -2337,6 +2337,42 @@ export async function registerRoutes(app: Express): Promise<Server> {
     }
   });
 
+  // Route pour les statistiques annuelles
+  app.get('/api/stats/yearly', isAuthenticated, async (req: any, res) => {
+    try {
+      const user = await storage.getUserWithGroups(req.user.claims ? req.user.claims.sub : req.user.id);
+      if (!user) {
+        return res.status(404).json({ message: "User not found" });
+      }
+
+      const { year, storeId } = req.query;
+      const currentYear = year ? parseInt(year as string) : new Date().getFullYear();
+
+      let groupIds: number[] | undefined;
+      
+      if (user.role === 'admin') {
+        // Admin can view all stores or filter by selected store
+        groupIds = storeId ? [parseInt(storeId as string)] : undefined;
+      } else {
+        // Non-admin users: filter by their assigned groups
+        const userGroupIds = user.userGroups.map(ug => ug.groupId);
+        
+        // If a specific store is selected and user has access, filter by it
+        if (storeId && userGroupIds.includes(parseInt(storeId as string))) {
+          groupIds = [parseInt(storeId as string)];
+        } else {
+          groupIds = userGroupIds;
+        }
+      }
+
+      const stats = await storage.getYearlyStats(currentYear, groupIds);
+      res.json(stats);
+    } catch (error) {
+      console.error("Error fetching yearly stats:", error);
+      res.status(500).json({ message: "Failed to fetch yearly statistics" });
+    }
+  });
+
   // User-Group management routes (admin only)
   app.post('/api/users/:userId/groups', isAuthenticated, async (req: any, res) => {
     try {