Initial WhaleTown V2 backend

src/business/notice/dto/create-notice.dto.ts

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+import { IsString, IsOptional, IsNumber, IsEnum, IsDateString, IsObject } from 'class-validator';
+import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
+import { NoticeType } from '../notice.entity';
+
+export class CreateNoticeDto {
+  @ApiProperty({ description: '通知标题' })
+  @IsString()
+  title: string;
+
+  @ApiProperty({ description: '通知内容' })
+  @IsString()
+  content: string;
+
+  @ApiPropertyOptional({ enum: NoticeType, description: '通知类型' })
+  @IsOptional()
+  @IsEnum(NoticeType)
+  type?: NoticeType;
+
+  @ApiPropertyOptional({ description: '接收者用户ID，不填表示广播' })
+  @IsOptional()
+  @IsNumber()
+  userId?: number;
+
+  @ApiPropertyOptional({ description: '发送者用户ID' })
+  @IsOptional()
+  @IsNumber()
+  senderId?: number;
+
+  @ApiPropertyOptional({ description: '计划发送时间' })
+  @IsOptional()
+  @IsDateString()
+  scheduledAt?: string;
+
+  @ApiPropertyOptional({ description: '额外元数据' })
+  @IsOptional()
+  @IsObject()
+  metadata?: Record<string, any>;
+}