refactor(identity-service): 简化DeviceNameDto为接收任意JSON对象

- 将DeviceNameDto从class改为interface
- 使用@IsObject()验证，允许前端传递任意设备信息字段
- 添加index signature允许扩展字段
- 后端只提取需要的字段存储到数据库

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

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

backend/services/identity-service/src/api/dto/request/auto-create-account.dto.ts

@@ -1,55 +1,22 @@
-import { IsString, IsOptional, IsNotEmpty, Matches, ValidateNested } from 'class-validator';
+import { IsString, IsOptional, IsNotEmpty, Matches, IsObject } from 'class-validator';
 import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
-import { Type } from 'class-transformer';
 
-export class DeviceNameDto {
-  @ApiPropertyOptional({ example: 'iPhone 15 Pro', description: '设备型号' })
-  @IsOptional()
-  @IsString()
-  model?: string;
-
-  @ApiPropertyOptional({ example: 'ios', description: '平台: ios, android, web' })
-  @IsOptional()
-  @IsString()
-  platform?: string;
-
-  @ApiPropertyOptional({ example: 'iOS 17.2', description: '系统版本' })
-  @IsOptional()
-  @IsString()
-  osVersion?: string;
-
-  @ApiPropertyOptional({ example: 'Apple', description: '品牌' })
-  @IsOptional()
-  @IsString()
-  brand?: string;
-
-  @ApiPropertyOptional({ example: 'Apple', description: '厂商' })
-  @IsOptional()
-  @IsString()
-  manufacturer?: string;
-
-  @ApiPropertyOptional({ example: 'iPhone15,2', description: '设备名' })
-  @IsOptional()
-  @IsString()
-  device?: string;
-
-  @ApiPropertyOptional({ example: 'iPhone15,2', description: '产品名' })
-  @IsOptional()
-  @IsString()
-  product?: string;
-
-  @ApiPropertyOptional({ example: 'qcom', description: '硬件名' })
-  @IsOptional()
-  @IsString()
-  hardware?: string;
-
-  @ApiPropertyOptional({ example: 33, description: 'SDK 版本 (Android)' })
-  @IsOptional()
-  sdkInt?: number;
-
-  @ApiPropertyOptional({ example: true, description: '是否真机' })
-  @IsOptional()
-  isPhysicalDevice?: boolean;
+/**
+ * 设备信息 - 接收任意 JSON 对象
+ * 前端可以传递完整的设备硬件信息，后端只提取需要的字段存储
+ */
+export interface DeviceNameDto {
+  model?: string;      // 设备型号
+  platform?: string;   // 平台: ios, android, web
+  osVersion?: string;  // 系统版本
+  brand?: string;      // 品牌
+  manufacturer?: string; // 厂商
+  device?: string;     // 设备名
+  product?: string;    // 产品名
+  hardware?: string;   // 硬件名
+  sdkInt?: number;     // SDK 版本 (Android)
+  isPhysicalDevice?: boolean; // 是否真机
+  [key: string]: unknown; // 允许其他字段
 }
 
 export class AutoCreateAccountDto {
@@ -58,10 +25,12 @@ export class AutoCreateAccountDto {
   @IsNotEmpty()
   deviceId: string;
 
-  @ApiPropertyOptional({ type: DeviceNameDto, description: '设备信息' })
+  @ApiPropertyOptional({
+    description: '设备信息 (JSON 对象)',
+    example: { model: 'iPhone 15 Pro', platform: 'ios', osVersion: '17.2' }
+  })
   @IsOptional()
-  @ValidateNested()
-  @Type(() => DeviceNameDto)
+  @IsObject()
   deviceName?: DeviceNameDto;
 
   @ApiPropertyOptional({ example: 'ABC123', description: '邀请人推荐码' })