1、分页添加默认项，

2、登录名冲突无"复用/认领"机制，教员永久无法开通账号
3、两条对齐路径对"停用教研室"处理不一致

backend/roomroot-jwgl/src/main/java/com/roomroot/jwgl/unit/PageQuery.java

@@ -23,7 +23,7 @@ public class PageQuery extends BaseQuery {
      */
     @NotNull(message = "页码不能为空")
     @Min(value = 1, message = "页码最小为1")
-    private Integer pageNum;
+    private Integer pageNum = 1;
 
     /**
      * 每页记录数，默认20条，最小1条，最大100条
@@ -31,7 +31,7 @@ public class PageQuery extends BaseQuery {
     @NotNull(message = "每页大小不能为空")
     @Min(value = 1, message = "每页最小为1条")
     @Max(value = 100, message = "每页最大为100条")
-    private Integer pageSize;
+    private Integer pageSize = 10;
 
     public PageQuery() {}