fix(identity-service): 修复手动重试钱包生成使用错误的事件类型

retryWalletGeneration 方法之前使用 createWalletGenerationEvent()
发布 UserAccountCreatedEvent，但 MPC 服务只监听 MpcKeygenRequestedEvent。

现在改为直接发布 MpcKeygenRequestedEvent，与 wallet-retry.task.ts 保持一致。

🤖 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

@@ -1878,12 +1878,22 @@ export class UserApplicationService {
         }
       }
 
-      // 4. 重新触发钱包生成流程
-      const event = account.createWalletGenerationEvent();
-      await this.eventPublisher.publish(event);
+      // 4. 重新触发钱包生成流程 - 使用 MpcKeygenRequestedEvent（MPC服务只监听此事件）
+      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(
-        `[WALLET-RETRY] Wallet generation retry triggered for user: ${userId}`,
+        `[WALLET-RETRY] Wallet generation retry triggered for user: ${userId}, sessionId=${sessionId}`,
       );
 
       // 5. 更新 Redis 状态为 pending（等待重新生成）