拆分了聊天数据，减小玩家数据结构大小

gs/model/chat.go

@@ -6,11 +6,11 @@ const (
 )
 
 type ChatMsg struct {
-	Time    uint32 `bson:"time"`
-	ToUid   uint32 `bson:"toUid"`
-	Uid     uint32 `bson:"uid"`
-	IsRead  bool   `bson:"isRead"`
-	MsgType uint8  `bson:"msgType"`
-	Text    string `bson:"text"`
-	Icon    uint32 `bson:"icon"`
+	Time    uint32
+	ToUid   uint32
+	Uid     uint32
+	IsRead  bool
+	MsgType uint8
+	Text    string
+	Icon    uint32
 }