fix(backend): 修复 UserService 中 createJoinRequest 调用

cfc-backend/src/main/java/com/etotem/cfc/service/UserService.java

@@ -1415,7 +1415,7 @@ FamilyMember child = familyMemberMapper.selectById(memberId);
             user = existingUser;
             ensureUserHasFamily(user);
             try {
-                familyJoinRequestService.createJoinRequest(user.getId(), inviteCode);
+                familyJoinRequestService.createJoinRequest(user.getId(), inviteCode, null);
                 log.info("已为用户 {} 提交加入家庭 {} 的请求", user.getId(), family.getId());
             } catch (Exception e) {
                 log.warn("提交加入家庭请求失败: {}", e.getMessage());
@@ -1433,7 +1433,7 @@ FamilyMember child = familyMemberMapper.selectById(memberId);
             user.setUpdatedAt(new Date());
             createUserAndFamily(user);
             try {
-                familyJoinRequestService.createJoinRequest(user.getId(), inviteCode);
+                familyJoinRequestService.createJoinRequest(user.getId(), inviteCode, null);
                 log.info("已为用户 {} 提交加入家庭 {} 的请求", user.getId(), family.getId());
             } catch (Exception e) {
                 log.warn("提交加入家庭请求失败: {}", e.getMessage());