feat(api): 更新用户模块支持头像功能

- 更新 AuthDto 调整验证规则
- 更新 UserDto 添加头像相关字段
- 更新 UserController 支持更新用户头像

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

apps/api/src/auth/dto/auth.dto.ts

@@ -65,6 +65,13 @@ export class AuthUserDto implements AuthUser {
 
   @ApiProperty({ example: '张三', description: '用户名称', nullable: true })
   name: string | null;
+
+  @ApiProperty({
+    example: 'clxxx456',
+    description: '用户头像文件 ID',
+    nullable: true,
+  })
+  avatarId: string | null;
 }
 
 /** 认证响应 DTO */

apps/api/src/user/dto/user.dto.ts

@@ -52,6 +52,13 @@ export class UserResponseDto implements UserResponse {
   @ApiProperty({ example: '张三', description: '用户名称', nullable: true })
   name: string | null;
 
+  @ApiProperty({
+    example: 'clxxx456',
+    description: '用户头像文件 ID',
+    nullable: true,
+  })
+  avatarId: string | null;
+
   @ApiProperty({ example: '2026-01-16T10:00:00.000Z', description: '创建时间' })
   createdAt: string;
 
@@ -73,6 +80,13 @@ export class UserWithRolesResponseDto implements UserWithRolesResponse {
   @ApiProperty({ example: '张三', description: '用户名称', nullable: true })
   name: string | null;
 
+  @ApiProperty({
+    example: 'clxxx456',
+    description: '用户头像文件 ID',
+    nullable: true,
+  })
+  avatarId: string | null;
+
   @ApiProperty({ example: false, description: '是否为超级管理员' })
   isSuperAdmin: boolean;
 

apps/api/src/user/user.controller.ts

@@ -1,5 +1,19 @@
-import { Controller, Get, Patch, Delete, Param, Body, Query, UseGuards } from '@nestjs/common';
-import { ApiTags, ApiOperation, ApiBearerAuth, ApiOkResponse } from '@nestjs/swagger';
+import {
+  Controller,
+  Get,
+  Patch,
+  Delete,
+  Param,
+  Body,
+  Query,
+  UseGuards,
+} from '@nestjs/common';
+import {
+  ApiTags,
+  ApiOperation,
+  ApiBearerAuth,
+  ApiOkResponse,
+} from '@nestjs/swagger';
 
 import {
   AssignRolesDto,