fix(trading): 为做市商 DTO 添加 class-validator 装饰器

修复做市商初始化失败问题。由于 ValidationPipe 配置了
forbidNonWhitelisted: true，没有装饰器的属性会被拒绝。

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

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

@@ -9,48 +9,117 @@ import {
   HttpStatus,
 } from '@nestjs/common';
 import { ApiTags, ApiOperation, ApiResponse, ApiQuery } from '@nestjs/swagger';
+import { IsString, IsOptional, IsNumber } from 'class-validator';
 import { MarketMakerService, LedgerType, AssetType } from '../../application/services/market-maker.service';
 import { Public } from '../../shared/guards/jwt-auth.guard';
 
 // DTO 定义
 class InitializeMarketMakerDto {
+  @IsOptional()
+  @IsString()
   name?: string;
+
+  @IsString()
   accountSequence: string;
+
+  @IsOptional()
+  @IsString()
   initialCash?: string;
+
+  @IsOptional()
+  @IsNumber()
   maxBuyRatio?: number;
+
+  @IsOptional()
+  @IsNumber()
   minIntervalMs?: number;
+
+  @IsOptional()
+  @IsNumber()
   maxIntervalMs?: number;
 }
 
 class DepositDto {
+  @IsString()
   amount: string;
+
+  @IsOptional()
+  @IsString()
   memo?: string;
 }
 
 class WithdrawDto {
+  @IsString()
   amount: string;
+
+  @IsOptional()
+  @IsString()
   memo?: string;
 }
 
 class UpdateConfigDto {
+  @IsOptional()
+  @IsNumber()
   maxBuyRatio?: number;
+
+  @IsOptional()
+  @IsNumber()
   minIntervalMs?: number;
+
+  @IsOptional()
+  @IsNumber()
   maxIntervalMs?: number;
+
+  @IsOptional()
+  @IsString()
   priceStrategy?: string;
+
+  @IsOptional()
+  @IsNumber()
   discountRate?: number;
 }
 
 class UpdateMakerConfigDto {
+  @IsOptional()
   bidEnabled?: boolean;
+
+  @IsOptional()
+  @IsNumber()
   bidLevels?: number;
+
+  @IsOptional()
+  @IsNumber()
   bidSpread?: number;
+
+  @IsOptional()
+  @IsNumber()
   bidLevelSpacing?: number;
+
+  @IsOptional()
+  @IsString()
   bidQuantityPerLevel?: string;
+
+  @IsOptional()
   askEnabled?: boolean;
+
+  @IsOptional()
+  @IsNumber()
   askLevels?: number;
+
+  @IsOptional()
+  @IsNumber()
   askSpread?: number;
+
+  @IsOptional()
+  @IsNumber()
   askLevelSpacing?: number;
+
+  @IsOptional()
+  @IsString()
   askQuantityPerLevel?: string;
+
+  @IsOptional()
+  @IsNumber()
   refreshIntervalMs?: number;
 }