fix(trading): 为所有 DTO 添加 class-validator 装饰器

修复 trading.controller、admin.controller、transfer.controller
的 DTO 验证问题，解决 App 下单时 400 错误。

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

backend/services/trading-service/src/api/controllers/admin.controller.ts

@@ -1,14 +1,17 @@
 import { Controller, Get, Post, Body, HttpCode, HttpStatus } from '@nestjs/common';
 import { ApiTags, ApiOperation, ApiResponse } from '@nestjs/swagger';
+import { IsBoolean } from 'class-validator';
 import { PrismaService } from '../../infrastructure/persistence/prisma/prisma.service';
 import { TradingConfigRepository } from '../../infrastructure/persistence/repositories/trading-config.repository';
 import { Public } from '../../shared/guards/jwt-auth.guard';
 
 class SetBuyEnabledDto {
+  @IsBoolean()
   enabled: boolean;
 }
 
 class SetDepthEnabledDto {
+  @IsBoolean()
   enabled: boolean;
 }
 

backend/services/trading-service/src/api/controllers/trading.controller.ts

@@ -1,13 +1,19 @@
 import { Controller, Get, Post, Param, Query, Body, NotFoundException, Req } from '@nestjs/common';
 import { ApiTags, ApiOperation, ApiResponse, ApiParam, ApiQuery, ApiBearerAuth } from '@nestjs/swagger';
+import { IsString, IsIn } from 'class-validator';
 import { OrderService } from '../../application/services/order.service';
 import { OrderRepository } from '../../infrastructure/persistence/repositories/order.repository';
 import { TradingAccountRepository } from '../../infrastructure/persistence/repositories/trading-account.repository';
 import { OrderType } from '../../domain/aggregates/order.aggregate';
 
 class CreateOrderDto {
+  @IsIn(['BUY', 'SELL'])
   type: 'BUY' | 'SELL';
+
+  @IsString()
   price: string;
+
+  @IsString()
   quantity: string;
 }
 

backend/services/trading-service/src/api/controllers/transfer.controller.ts

@@ -1,8 +1,10 @@
 import { Controller, Get, Post, Param, Query, Body, Req } from '@nestjs/common';
 import { ApiTags, ApiOperation, ApiResponse, ApiBearerAuth, ApiQuery } from '@nestjs/swagger';
+import { IsString } from 'class-validator';
 import { TransferService } from '../../application/services/transfer.service';
 
 class TransferDto {
+  @IsString()
   amount: string;
 }