Add system for managing and scheduling data backups

Introduce a new backup management feature with automated scheduling, manual backups, and a dedicated interface for viewing backup status and details. This includes integrating `node-cron` for scheduling, updating the database schema to store backup information, and creating new routes and components for the backup manager.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 7c468936-2a88-4686-ac0a-84921a45222d
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/1957c339-2757-4d1f-8e92-e9f71a1ce58e/7c468936-2a88-4686-ac0a-84921a45222d/9xfbVBU

client/src/components/Layout.tsx

@@ -138,7 +138,7 @@ export default function Layout({ children }: LayoutProps) {
                         <div className="flex items-center gap-2">
                           <div 
                             className="w-3 h-3" 
-                            style={{ backgroundColor: store.color }}
+                            style={{ backgroundColor: store.color || '#gray-400' }}
                           />
                           <span>{store.name}</span>
                         </div>

client/src/components/RouterProduction.tsx

@@ -17,6 +17,7 @@ import DatabaseDebug from "@/pages/DatabaseDebug";
 import CustomerOrders from "@/pages/CustomerOrders";
 
 import DlcPage from "@/pages/DlcPage";
+import BackupManager from "@/pages/BackupManager";
 import Tasks from "@/pages/Tasks";
 import TasksSimplified from "@/pages/TasksSimplified";
 import Layout from "@/components/Layout";
@@ -76,6 +77,7 @@ function RouterProduction() {
         <Route path="/publicities" component={Publicities} />
         <Route path="/customer-orders" component={CustomerOrders} />
         <Route path="/dlc" component={DlcPage} />
+        <Route path="/backup" component={BackupManager} />
         <Route path="/tasks" component={Tasks} />
         <Route path="/nocodb-config" component={NocoDBConfig} />
         <Route path="/database-debug" component={DatabaseDebug} />

client/src/components/Sidebar.tsx

@@ -146,6 +146,12 @@ export default function Sidebar() {
       icon: UserCog, 
       roles: ["admin"] 
     },
+    { 
+      path: "/backup", 
+      label: "Sauvegardes", 
+      icon: Database, 
+      roles: ["admin"] 
+    },
     { 
       path: "/nocodb-config", 
       label: "Configuration NocoDB",