fix(backend): 修复构建错误并添加 TOTP 数据库迁移

修复内容:
- identity-service: 添加 CurrentUserPayload 接口定义
- identity-service: 添加 user_totp 表的数据库迁移文件
- wallet-service: 安装 axios 依赖
- wallet-service: 修复 withdrawal-status.handler.ts 中的类型错误
  - userId.toString() → userId.value (BigInt 类型)
  - unfreezeUsdt() → unfreeze() (正确的方法名)
  - amount.asNumber → amount.value (Money 值对象属性)

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

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

backend/services/identity-service/prisma/migrations/20251215000000_add_user_totp/migration.sql

@@ -0,0 +1,21 @@
+-- CreateTable: user_totp
+-- TOTP 二次验证表，用于提现、转账等敏感操作
+
+CREATE TABLE "user_totp" (
+    "id" BIGSERIAL NOT NULL,
+    "user_id" BIGINT NOT NULL,
+    "encrypted_secret" VARCHAR(100) NOT NULL,
+    "is_enabled" BOOLEAN NOT NULL DEFAULT false,
+    "is_verified" BOOLEAN NOT NULL DEFAULT false,
+    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "enabled_at" TIMESTAMP(3),
+    "updated_at" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "user_totp_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateIndex
+CREATE UNIQUE INDEX "user_totp_user_id_key" ON "user_totp"("user_id");
+
+-- CreateIndex
+CREATE INDEX "idx_totp_user" ON "user_totp"("user_id");

backend/services/identity-service/src/shared/decorators/index.ts

@@ -1,6 +1,12 @@
 import { createParamDecorator, ExecutionContext, SetMetadata } from '@nestjs/common';
 import { IS_PUBLIC_KEY } from '../guards/jwt-auth.guard';
 
+export interface CurrentUserPayload {
+  userId: string;
+  accountSequence: string;
+  deviceId: string;
+}
+
 export const CurrentUser = createParamDecorator(
   (data: unknown, ctx: ExecutionContext) => {
     const request = ctx.switchToHttp().getRequest();

backend/services/wallet-service/package.json

@@ -38,6 +38,7 @@
     "@nestjs/schedule": "^4.1.2",
     "@nestjs/swagger": "^7.1.17",
     "@prisma/client": "^5.7.0",
+    "axios": "^1.13.2",
     "class-transformer": "^0.5.1",
     "class-validator": "^0.14.0",
     "decimal.js": "^10.4.3",

backend/services/wallet-service/src/application/event-handlers/withdrawal-status.handler.ts

@@ -103,12 +103,12 @@ export class WithdrawalStatusHandler implements OnModuleInit {
 
       // Refund frozen funds back to available balance if needed
       if (order.needsUnfreeze()) {
-        const wallet = await this.walletRepo.findByUserId(order.userId.toString());
+        const wallet = await this.walletRepo.findByUserId(order.userId.value);
         if (wallet) {
           // Unfreeze the amount (add back to available balance)
-          wallet.unfreezeUsdt(order.amount.asNumber);
+          wallet.unfreeze(order.amount);
           await this.walletRepo.save(wallet);
-          this.logger.log(`[FAILED] Refunded ${order.amount.asNumber} USDT to user ${order.userId}`);
+          this.logger.log(`[FAILED] Refunded ${order.amount.value} USDT to user ${order.userId}`);
         }
       }