refactor: migrate backend framework from Express to NestJS

src/auth/dto/index.ts

@@ -0,0 +1,31 @@
+import { IsString, IsNotEmpty, MinLength, IsEmail, IsOptional } from 'class-validator';
+
+export class LoginDto {
+  @IsString()
+  @IsNotEmpty({ message: '用户名不能为空' })
+  username: string;
+
+  @IsString()
+  @IsNotEmpty({ message: '密码不能为空' })
+  password: string;
+}
+
+export class ChangePasswordDto {
+  @IsString()
+  @IsNotEmpty({ message: '当前密码不能为空' })
+  currentPassword: string;
+
+  @IsString()
+  @MinLength(6, { message: '新密码长度至少为6位' })
+  newPassword: string;
+}
+
+export class UpdateProfileDto {
+  @IsString()
+  @IsNotEmpty({ message: '姓名不能为空' })
+  name: string;
+
+  @IsOptional()
+  @IsEmail({}, { message: '邮箱格式不正确' })
+  email?: string;
+}