feat: add authentication system (login, users, auth middleware)

- server/auth.js: JWT middleware and auth routes
- src/stores/auth.js + useAuthFetch.js: client-side auth state
- src/views/LoginView.vue + UsersView.vue: login and user management UI
- router, sidebar, App.vue: guard routes behind auth
- COOLIFY.md: add real deployment IDs

src/components/AppSidebar.vue

@@ -6,6 +6,7 @@ import {
   Activity,
   GraduationCap,
   History,
+  UserCog,
 } from "lucide-vue-next";
 
 const route = useRoute();
@@ -41,6 +42,12 @@ const navItems = [
     icon: History,
     label: "Historique Global",
   },
+  {
+    to: "/users",
+    name: "users",
+    icon: UserCog,
+    label: "Utilisateurs",
+  },
 ];
 
 const isActive = (name) => route.name === name;