实现游戏大厅与房间模块：玩法插件化、匹配与房间生命周期管理

internal/wsgateway/envelope.go

@@ -13,18 +13,27 @@ import (
 const (
 	TypePing = "ping" // 应用层心跳：客户端周期性发送，服务端原样回 pong
 
-	// TODO(第二步 大厅)：在此补充 TypeHallMatch = "hall.match"、TypeHallCancel = "hall.cancel"
-	// TODO(第二步 房间)：在此补充 TypeRoomJoin = "room.join"、TypeRoomReady = "room.ready"、
-	//                    TypeRoomAction = "room.action"、TypeRoomLeave = "room.leave"、
-	//                    TypeRoomReconnect = "room.reconnect"
+	TypeHallMatch     = "hall.match"
+	TypeHallCancel    = "hall.cancel"
+	TypeRoomJoin      = "room.join"
+	TypeRoomReady     = "room.ready"
+	TypeRoomAction    = "room.action"
+	TypeRoomLeave     = "room.leave"
+	TypeRoomReconnect = "room.reconnect"
 )
 
 // ===== 下行消息类型：服务端 → 客户端 =====
 const (
-	TypeHello = "hello" // 建连成功后下发的首条消息，携带 userID 与心跳建议间隔
-	TypePong  = "pong"  // 对上行 ping 的应答
-	TypeEvent = "event" // 业务事件统一信封：房间状态、对局事件等都走这个类型，payload 由各模块自定义
-	TypeError = "error" // 错误下行：参数错误、未支持类型、业务错误统一走这里
+	TypeHello         = "hello"          // 建连成功后下发的首条消息，携带 userID 与心跳建议间隔
+	TypePong          = "pong"           // 对上行 ping 的应答
+	TypeEvent         = "event"          // 业务事件统一信封：房间状态、对局事件等都走这个类型，payload 由各模块自定义
+	TypeError         = "error"          // 错误下行：参数错误、未支持类型、业务错误统一走这里
+	TypeHallMatched   = "hall.matched"   // 匹配成功，携带房间 ID
+	TypeHallCancelled = "hall.cancelled" // 匹配已取消
+	TypeRoomState     = "room.state"     // 房间全量快照
+	TypeRoomEvent     = "room.event"     // 玩法增量事件
+	TypeRoomFinished  = "room.finished"  // 对局结束与结算
+	TypeRoomClosed    = "room.closed"    // 房间已关闭
 )
 
 // Envelope 是上下行消息的统一信封。