fix: 修复GuideController与BindInviteController API路径冲突

- GuideController: /api/guide/bind/invite 改为 /api/guide/invite-link
- BindInviteController保留 /api/guide/bind/invite
- 避免Ambiguous mapping错误

zxyj-backend/src/main/java/com/zxyj/controller/GuideController.java

@@ -34,10 +34,10 @@ public class GuideController {
     private UserMapper userMapper;
 
     /**
-     * 生成绑定邀请
+     * 生成绑定邀请链接
      */
-    @Operation(summary = "生成绑定邀请")
-    @PostMapping("/bind/invite")
+    @Operation(summary = "生成绑定邀请链接")
+    @PostMapping("/invite-link")
     public Result<Map<String, String>> generateBindInvite(@RequestAttribute("userId") Long userId) {
         // 获取当前用户家庭
         User user = new User();