fix(backend): 修复 createJoinRequest 调用参数

cfc-backend/src/main/java/com/etotem/cfc/controller/family/FamilyUserController.java

@@ -68,7 +68,7 @@ public class FamilyUserController {
         }
 
         try {
-            FamilyJoinRequest request = familyJoinRequestService.createJoinRequest(userId, inviteCode);
+            FamilyJoinRequest request = familyJoinRequestService.createJoinRequest(userId, inviteCode, null);
             Family family = familyMapper.selectById(request.getTargetFamilyId());
             Map<String, Object> result = new HashMap<>();
             result.put("requestId", request.getId());

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

@@ -520,7 +520,7 @@ private FamilyInvitationService familyInvitationService;
         // 如果有邀请码，提交加入家庭请求（需管理员审批）
         if (dto.getInviteCode() != null && !dto.getInviteCode().isEmpty()) {
             try {
-                familyJoinRequestService.createJoinRequest(user.getId(), dto.getInviteCode());
+                familyJoinRequestService.createJoinRequest(user.getId(), dto.getInviteCode(), null);
             } catch (Exception e) {
                 // 忽略邀请码错误
             }