feat: add video websocket handler etc...

src/main/java/xin/merlin/myplayerbackend/entity/Playrooms.java

@@ -4,10 +4,12 @@ package xin.merlin.myplayerbackend.entity;
 import com.baomidou.mybatisplus.annotation.TableName;
 import lombok.AllArgsConstructor;
 import lombok.Data;
+import lombok.NoArgsConstructor;
 
 @Data
 @TableName("playrooms")
 @AllArgsConstructor
+@NoArgsConstructor
 public class Playrooms {
     private Integer r_id;
     private Integer id;