feat: Complete admin panel implementation

- Add user management system with all CRUD operations
- Add promotion statistics dashboard with export
- Simplify Trading & Market settings UI
- Fix promotion schema (dates now optional)
- Add missing API endpoints and PATCH support
- Add comprehensive documentation
- Fix critical bugs (deletePromotion, duplicate endpoints)

All features tested and production-ready.

index.js

@@ -10,6 +10,9 @@ import { connectDatabase } from "./config/database.js";
 import { configurePassport } from "./config/passport.js";
 import { wsManager } from "./utils/websocket.js";
 
+// Import middleware
+import { checkMaintenance } from "./middleware/maintenance.js";
+
 // Import routes
 import authRoutes from "./routes/auth.js";
 import userRoutes from "./routes/user.js";
@@ -17,6 +20,8 @@ import websocketRoutes from "./routes/websocket.js";
 import marketRoutes from "./routes/market.js";
 import inventoryRoutes from "./routes/inventory.js";
 import adminRoutes from "./routes/admin.js";
+import adminManagementRoutes from "./routes/admin-management.js";
+import configRoutes from "./routes/config.js";
 
 // Import services
 import pricingService from "./services/pricing.js";
@@ -219,6 +224,9 @@ const registerRoutes = async (fastify) => {
     });
   });
 
+  // Register maintenance mode check globally (before routes)
+  fastify.addHook("preHandler", checkMaintenance);
+
   // Register auth routes WITHOUT /api prefix for Steam OAuth (external callback)
   await fastify.register(authRoutes, { prefix: "/auth" });
 
@@ -231,8 +239,11 @@ const registerRoutes = async (fastify) => {
   await fastify.register(marketRoutes, { prefix: "/api/market" });
   await fastify.register(inventoryRoutes, { prefix: "/api/inventory" });
   await fastify.register(adminRoutes, { prefix: "/api/admin" });
+  await fastify.register(adminManagementRoutes, { prefix: "/api/admin" });
+  await fastify.register(configRoutes, { prefix: "/api/config" });
 
   console.log("✅ All routes registered");
+  console.log("✅ Maintenance mode middleware active");
 };
 
 /**