放大金币发放/赠送的最大额度至 999999999；同步后端允许平级用户互相执行管理操作

app/Http/Controllers/ChatController.php

@@ -1156,7 +1156,7 @@ class ChatController extends Controller
         $request->validate([
             'to_user' => 'required|string',
             'room_id' => 'required|integer',
-            'amount' => 'required|integer|min:1|max:999999',
+            'amount' => 'required|integer|min:1|max:999999999',
         ]);
 
         $sender = Auth::user();