Add analytics dashboard for tracking key performance metrics

Adds new analytics routes and functionality to display summary data, time series, and supplier/store breakdowns, with role-based access control.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 1e4433b5-47ab-464c-b663-fea2e53367dd
Replit-Commit-Checkpoint-Type: intermediate_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/1957c339-2757-4d1f-8e92-e9f71a1ce58e/1e4433b5-47ab-464c-b663-fea2e53367dd/nSTv9k9

client/src/components/RouterProduction.tsx

@@ -23,6 +23,7 @@ import Tasks from "@/pages/Tasks";
 import SavTickets from "@/pages/SavTickets";
 import Avoirs from "@/pages/Avoirs";
 import WeatherSettings from "@/pages/WeatherSettings";
+import Analytics from "@/pages/Analytics";
 import Layout from "@/components/Layout";
 
 function RouterProduction() {
@@ -102,6 +103,7 @@ function RouterProduction() {
         <Route path="/tasks" component={Tasks} />
         <Route path="/sav" component={SavTickets} />
         <Route path="/avoirs" component={Avoirs} />
+        <Route path="/analytics" component={Analytics} />
         
         {/* Routes de compatibilité - redirection vers utilities */}
         <Route path="/backup" component={Utilities} />

client/src/components/Sidebar.tsx

@@ -257,6 +257,12 @@ export default function Sidebar() {
       icon: FileText, 
       roles: ["admin", "directeur"] 
     },
+    { 
+      path: "/analytics", 
+      label: "Statistiques", 
+      icon: BarChart3, 
+      roles: ["admin", "directeur", "manager"] 
+    },
     { 
       path: "/avoirs", 
       label: "Avoirs",