fix(identity-service): 修复钱包重试发布错误事件类型的问题

问题：
- 重试代码使用 createWalletGenerationEvent() 发布 UserAccountCreatedEvent
- 该事件发布到 identity.UserAccountCreated topic
- 但 MPC 服务监听的是 mpc.KeygenRequested topic
- 导致重试触发成功但钱包不会被生成

修复：
- triggerWalletRetryAsync: 改为发布 MpcKeygenRequestedEvent
- WalletRetryTask.retryWalletGeneration: 改为发布 MpcKeygenRequestedEvent
- 与注册流程使用相同的事件类型和参数格式

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

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

backend/services/identity-service/src/application/services/user-application.service.ts

@@ -1752,16 +1752,26 @@ export class UserApplicationService {
    * 异步触发钱包生成重试
    *
    * 内部方法，由 getWalletStatus 调用
-   * 重新发布 UserAccountCreatedEvent 触发 MPC 生成流程
+   * 发布 MpcKeygenRequestedEvent 触发 MPC 生成流程
    */
   private async triggerWalletRetryAsync(
     userId: string,
     account: UserAccount,
   ): Promise<void> {
     try {
-      // 发布事件触发钱包生成
-      const event = account.createWalletGenerationEvent();
-      await this.eventPublisher.publish(event);
+      // 发布 MpcKeygenRequestedEvent 触发钱包生成（与注册流程使用相同的事件类型）
+      const sessionId = crypto.randomUUID();
+      await this.eventPublisher.publish(
+        new MpcKeygenRequestedEvent({
+          sessionId,
+          userId: account.userId.toString(),
+          accountSequence: account.accountSequence.value,
+          username: `user_${account.accountSequence.value}`,
+          threshold: 2,
+          totalParties: 3,
+          requireDelegate: true,
+        }),
+      );
 
       // 更新 Redis 状态为 pending
       const statusData = {
@@ -1777,7 +1787,7 @@ export class UserApplicationService {
       );
 
       this.logger.log(
-        `[WALLET-STATUS] Wallet generation retry triggered for user ${userId}`,
+        `[WALLET-STATUS] Wallet generation retry triggered for user ${userId}, sessionId=${sessionId}`,
       );
     } catch (error) {
       this.logger.error(

backend/services/identity-service/src/application/tasks/wallet-retry.task.ts

@@ -28,6 +28,7 @@ import {
 } from '@/domain/repositories/user-account.repository.interface';
 import { Inject } from '@nestjs/common';
 import { UserId } from '@/domain/value-objects';
+import { MpcKeygenRequestedEvent } from '@/domain/events';
 
 // Redis key prefix
 const KEYGEN_STATUS_PREFIX = 'keygen:status:';
@@ -284,7 +285,7 @@ export class WalletRetryTask {
   /**
    * 执行钱包生成重试
    *
-   * 幂等：重新发布 UserAccountCreatedEvent，由 MPC 服务处理
+   * 发布 MpcKeygenRequestedEvent 触发 MPC 服务生成钱包
    */
   private async retryWalletGeneration(userId: string): Promise<void> {
     this.logger.log(`[TASK] Retrying wallet generation for user: ${userId}`);
@@ -302,12 +303,22 @@ export class WalletRetryTask {
       // 2. 更新重试记录（包含指数退避时间）
       const retryCount = await this.updateRetryRecord(userId);
 
-      // 3. 重新触发钱包生成流程
-      const event = account.createWalletGenerationEvent();
-      await this.eventPublisher.publish(event);
+      // 3. 发布 MpcKeygenRequestedEvent 触发钱包生成（与注册流程使用相同的事件类型）
+      const sessionId = crypto.randomUUID();
+      await this.eventPublisher.publish(
+        new MpcKeygenRequestedEvent({
+          sessionId,
+          userId: account.userId.toString(),
+          accountSequence: account.accountSequence.value,
+          username: `user_${account.accountSequence.value}`,
+          threshold: 2,
+          totalParties: 3,
+          requireDelegate: true,
+        }),
+      );
 
       this.logger.log(
-        `[TASK] Wallet generation retry #${retryCount} triggered for user: ${userId}`,
+        `[TASK] Wallet generation retry #${retryCount} triggered for user: ${userId}, sessionId=${sessionId}`,
       );
 
       // 4. 更新 Redis 状态为 pending