fix(referral): fix direct referral list display and count issues

1. Return accountSequence instead of userId for direct referral list display
2. Create missing team statistics record when referrer doesn't have one

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/services/referral-service/src/api/dto/referral.dto.ts

@@ -84,6 +84,9 @@ export class DirectReferralResponseDto {
   @ApiProperty({ description: '用户ID' })
   userId: string;
 
+  @ApiProperty({ description: '账户序列号 (8位)' })
+  accountSequence: number;
+
   @ApiProperty({ description: '推荐码' })
   referralCode: string;
 

backend/services/referral-service/src/application/queries/get-direct-referrals.query.ts

@@ -8,6 +8,7 @@ export class GetDirectReferralsQuery {
 
 export interface DirectReferralResult {
   userId: string;
+  accountSequence: number;  // 8位账户序列号，显示用
   referralCode: string;
   teamCount: number;
   joinedAt: Date;

backend/services/referral-service/src/application/services/referral.service.ts

@@ -91,11 +91,14 @@ export class ReferralService {
 
     // 如果有推荐人,更新推荐人的直推计数
     if (referrerId) {
-      const referrerStats = await this.teamStatsRepo.findByUserId(referrerId);
-      if (referrerStats) {
-        referrerStats.addDirectReferral(command.userId);
-        await this.teamStatsRepo.save(referrerStats);
+      let referrerStats = await this.teamStatsRepo.findByUserId(referrerId);
+      // 如果推荐人没有统计记录（历史用户），先创建
+      if (!referrerStats) {
+        this.logger.warn(`Creating missing team statistics for referrer ${referrerId}`);
+        referrerStats = await this.teamStatsRepo.create(referrerId);
       }
+      referrerStats.addDirectReferral(command.userId);
+      await this.teamStatsRepo.save(referrerStats);
     }
 
     // 发布领域事件
@@ -160,6 +163,7 @@ export class ReferralService {
 
     const referrals = paginated.map((r) => ({
       userId: r.userId.toString(),
+      accountSequence: r.accountSequence,  // 8位账户序列号，用于前端显示
       referralCode: r.referralCode,
       teamCount: directStats.get(r.userId) ?? 0,
       joinedAt: r.createdAt,

frontend/mobile-app/lib/core/services/referral_service.dart

@@ -52,12 +52,14 @@ class ReferralInfoResponse {
 /// 直推成员信息
 class DirectReferralInfo {
   final String userId;
+  final int accountSequence;  // 8位账户序列号，用于显示
   final String referralCode;
   final int teamCount;
   final DateTime joinedAt;
 
   DirectReferralInfo({
     required this.userId,
+    required this.accountSequence,
     required this.referralCode,
     required this.teamCount,
     required this.joinedAt,
@@ -66,6 +68,7 @@ class DirectReferralInfo {
   factory DirectReferralInfo.fromJson(Map<String, dynamic> json) {
     return DirectReferralInfo(
       userId: json['userId']?.toString() ?? '',
+      accountSequence: json['accountSequence'] ?? 0,
       referralCode: json['referralCode'] ?? '',
       teamCount: json['teamCount'] ?? 0,
       joinedAt: json['joinedAt'] != null

frontend/mobile-app/lib/features/profile/presentation/pages/profile_page.dart

@@ -267,7 +267,7 @@ class _ProfilePageState extends ConsumerState<ProfilePage> {
 
           // 转换直推列表格式
           _referrals = directReferrals.referrals.map((r) => <String, dynamic>{
-            'serial': r.userId,
+            'serial': r.accountSequence,  // 使用8位账户序列号显示
             'personal': 0, // API暂未返回个人认种量
             'team': r.teamCount,
           }).toList();