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-admin/src/main/java/com/roomroot/web/controller/jwgl/JYSController.java

@@ -1,5 +1,6 @@
 package com.roomroot.web.controller.jwgl;
 
+import com.roomroot.common.core.domain.entity.SysUser;
 import com.roomroot.common.utils.StringUtils;
 import com.roomroot.jwgl.dto.faculty.AddTeacherDTO;
 import com.roomroot.jwgl.dto.jys.ElectiveCourseBatchDTO;
@@ -225,7 +226,13 @@ public class JYSController {
         if (entity == null) {
             return Result.error("教员不存在：" + jybh);
         }
-        return Result.success(orgSyncService.ensureTeacherUser(entity, loginName, password, roleId));
+        SysUser user = orgSyncService.ensureTeacherUser(entity, loginName, password, roleId);
+        String expected = StringUtils.hasText(loginName) ? loginName.trim() : jybh;
+        if (!expected.equals(user.getUserName())) {
+            return Result.success("登录名 " + expected + " 已被无关账号占用，已自动改用 "
+                    + user.getUserName(), user.getUserId());
+        }
+        return Result.success(user.getUserId());
     }
 
     /**