feat: add app and database modules

app/Http/Controllers/SystemSettings/MaintenanceModeController.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace App\Http\Controllers\SystemSettings;
+
+use App\Http\Controllers\Controller;
+use App\Services\System\MaintenanceManagementService;
+use App\Services\SystemConfig\SystemConfigService;
+use Illuminate\Http\Request;
+
+class MaintenanceModeController extends Controller
+{
+    public function __construct(
+        protected SystemConfigService $systemConfig,
+        protected MaintenanceManagementService $maintenanceService
+    ) {
+        // Middleware handled in web.php
+    }
+
+    public function index()
+    {
+        return view('pages.system_settings.maintenance-mode', [
+            'settings' => $this->systemConfig->all(),
+            'is_down' => $this->maintenanceService->isDown(),
+        ]);
+    }
+
+    public function broadcast(Request $request)
+    {
+        $validated = $request->validate([
+            'minutes' => ['required', 'integer', 'min:1', 'max:60'],
+        ]);
+
+        $this->maintenanceService->broadcastWarning($validated['minutes']);
+
+        return response()->json([
+            'success' => true,
+            'message' => __('Broadcast warning sent to all active users.'),
+        ]);
+    }
+}