修复删除管理员后，无法新增一个相同管理员的bug（唯一索引对应数据列清除）

code/backend/src/main/java/com/aijiuyi/admin/service/impl/AdminServiceImpl.java

@@ -19,6 +19,8 @@ import org.springframework.stereotype.Service;
 import org.springframework.util.DigestUtils;
 import org.springframework.util.StringUtils;
 
+import java.time.LocalDateTime;
+import java.util.Collections;
 import java.util.List;
 
 /**
@@ -169,7 +171,7 @@ public class AdminServiceImpl extends ServiceImpl<AppUserMapper, AppUser> implem
         if (Integer.valueOf(1).equals(admin.getAdminRole())) {
             throw new BusinessException(ResultCode.ADMIN_CANNOT_DELETE);
         }
-        removeById(id);
+        logicDeleteAdminsAndReleaseUniqueFields(Collections.singletonList(id));
         LogUtil.info(AdminServiceImpl.class, "删除管理员[{}]", id);
     }
 
@@ -181,20 +183,35 @@ public class AdminServiceImpl extends ServiceImpl<AppUserMapper, AppUser> implem
      */
     @Override
     public void batchDeleteAdmin(List<Long> ids) {
-        for (Long id : ids) {
-            AppUser admin = getById(id);
-            if (admin != null && Integer.valueOf(1).equals(admin.getAdminRole())) {
+        if (ids == null || ids.isEmpty()) {
+            throw new BusinessException(ResultCode.PARAM_ERROR);
+        }
+        List<AppUser> admins = lambdaQuery()
+                .in(AppUser::getId, ids)
+                .eq(AppUser::getUserType, 3)
+                .list();
+        for (AppUser admin : admins) {
+            if (Integer.valueOf(1).equals(admin.getAdminRole())) {
                 throw new BusinessException(ResultCode.ADMIN_CANNOT_DELETE);
             }
         }
-        // 仅删除 userType=3 的记录，防止误删其他类型用户
-        LambdaQueryWrapper<AppUser> wrapper = new LambdaQueryWrapper<AppUser>()
-                .in(AppUser::getId, ids)
-                .eq(AppUser::getUserType, 3);
-        remove(wrapper);
+        if (!admins.isEmpty()) {
+            logicDeleteAdminsAndReleaseUniqueFields(ids);
+        }
         LogUtil.info(AdminServiceImpl.class, "批量删除管理员，ID列表：{}", ids);
     }
 
+    private void logicDeleteAdminsAndReleaseUniqueFields(List<Long> ids) {
+        lambdaUpdate()
+                .in(AppUser::getId, ids)
+                .eq(AppUser::getUserType, 3)
+                .set(AppUser::getUsername, null)
+                .set(AppUser::getPhone, null)
+                .set(AppUser::getDeleted, 1)
+                .set(AppUser::getUpdateTime, LocalDateTime.now())
+                .update();
+    }
+
     /**
      * 修改管理员状态（禁用/启用）
      * 不允许禁用当前登录账号自身