feat: register logic refactor

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

@@ -0,0 +1,13 @@
+package xin.merlin.myplayerbackend.entity;
+
+
+import com.baomidou.mybatisplus.annotation.TableName;
+import lombok.Data;
+
+@Data
+@TableName("playrooms")
+public class Playrooms {
+    private Integer r_id;
+    private Integer id;
+    private Integer role;
+}