feat(user): Add logic to conditionally display "Add as Ladder User" button

- Implemented a check to hide the "Add as Ladder User" button for users already designated as ladder users in any store.
- Enhanced the user retrieval process to include a flag indicating whether a user is a ladder user, optimizing front-end rendering and reducing unnecessary actions.

admin/src/views/user/index.vue

@@ -73,7 +73,12 @@
               <el-button type="primary" link @click="handleView(row)"
                 >查看</el-button
               >
-              <el-button type="primary" link @click="handleAddLadderUser(row)"
+              <!-- 如果该用户已经是任意门店的天梯用户，则不再展示“添加为天梯用户”按钮 -->
+              <el-button
+                v-if="!row.hasLadderUser"
+                type="primary"
+                link
+                @click="handleAddLadderUser(row)"
                 >添加为天梯用户</el-button
               >
               <el-button

server/src/controllers/adminController.js

@@ -125,6 +125,17 @@ class AdminController {
         offset
       });
 
+      // 批量查询这些用户是否已是任意门店的天梯用户，避免在前端逐个额外请求
+      const userIds = rows.map(u => u.id);
+      let ladderUserIdSet = new Set();
+      if (userIds.length > 0) {
+        const ladderUsers = await LadderUser.findAll({
+          where: { user_id: { [Op.in]: userIds } },
+          attributes: ['user_id']
+        });
+        ladderUserIdSet = new Set(ladderUsers.map(lu => lu.user_id));
+      }
+
       res.json(pageResult(rows.map(user => ({
         id: user.id,
         nickname: user.nickname,
@@ -134,7 +145,9 @@ class AdminController {
         memberCode: user.member_code,
         totalPoints: user.total_points,
         status: user.status,
-        createdAt: user.created_at
+        createdAt: user.created_at,
+        // 前端根据该字段隐藏“添加为天梯用户”按钮
+        hasLadderUser: ladderUserIdSet.has(user.id)
       })), count, page, pageSize));
     } catch (err) {
       console.error('获取用户列表失败:', err);