/**
 * @swagger
 * components:
 *   schemas:
 *     Announcement:
 *       type: object
 *       required:
 *         - title
 *         - content
 *         - type
 *         - priority
 *       properties:
 *         id:
 *           type: integer
 *           description: 公告ID
 *           example: 1
 *         title:
 *           type: string
 *           description: 公告标题
 *           example: "系统维护通知"
 *         content:
 *           type: string
 *           description: 公告内容
 *           example: "系统将于今晚进行维护，预计维护时间2小时，期间可能影响部分功能使用。"
 *         type:
 *           type: string
 *           description: 公告类型
 *           enum: [system, activity, maintenance, urgent]
 *           example: "maintenance"
 *         priority:
 *           type: string
 *           description: 优先级
 *           enum: [high, medium, low]
 *           example: "high"
 *         status:
 *           type: string
 *           description: 公告状态
 *           enum: [draft, published, expired]
 *           example: "published"
 *         isTop:
 *           type: boolean
 *           description: 是否置顶
 *           example: false
 *         publishTime:
 *           type: string
 *           format: date-time
 *           description: 发布时间
 *           example: "2024-01-15T10:00:00Z"
 *         expireTime:
 *           type: string
 *           format: date-time
 *           description: 过期时间
 *           example: "2024-01-20T10:00:00Z"
 *         createdBy:
 *           type: integer
 *           description: 创建者用户ID
 *           example: 1
 *         createdAt:
 *           type: string
 *           format: date-time
 *           description: 创建时间
 *           example: "2024-01-15T09:00:00Z"
 *         updatedAt:
 *           type: string
 *           format: date-time
 *           description: 更新时间
 *           example: "2024-01-15T09:30:00Z"
 *         creator:
 *           type: object
 *           description: 创建者信息
 *           properties:
 *             id:
 *               type: integer
 *               example: 1
 *             username:
 *               type: string
 *               example: "admin"
 *             email:
 *               type: string
 *               example: "admin@example.com"
 *
 *     AnnouncementCreate:
 *       type: object
 *       required:
 *         - title
 *         - content
 *         - type
 *         - priority
 *       properties:
 *         title:
 *           type: string
 *           description: 公告标题
 *           example: "系统维护通知"
 *         content:
 *           type: string
 *           description: 公告内容
 *           example: "系统将于今晚进行维护，预计维护时间2小时。"
 *         type:
 *           type: string
 *           description: 公告类型
 *           enum: [system, activity, maintenance, urgent]
 *           example: "maintenance"
 *         priority:
 *           type: string
 *           description: 优先级
 *           enum: [high, medium, low]
 *           example: "high"
 *         status:
 *           type: string
 *           description: 公告状态
 *           enum: [draft, published]
 *           default: draft
 *           example: "draft"
 *         isTop:
 *           type: boolean
 *           description: 是否置顶
 *           default: false
 *           example: false
 *         publishTime:
 *           type: string
 *           format: date-time
 *           description: 发布时间
 *           example: "2024-01-15T10:00:00Z"
 *         expireTime:
 *           type: string
 *           format: date-time
 *           description: 过期时间
 *           example: "2024-01-20T10:00:00Z"
 *
 *     AnnouncementUpdate:
 *       type: object
 *       properties:
 *         title:
 *           type: string
 *           description: 公告标题
 *           example: "系统维护通知（更新）"
 *         content:
 *           type: string
 *           description: 公告内容
 *           example: "系统维护时间调整为明晚进行。"
 *         type:
 *           type: string
 *           description: 公告类型
 *           enum: [system, activity, maintenance, urgent]
 *           example: "maintenance"
 *         priority:
 *           type: string
 *           description: 优先级
 *           enum: [high, medium, low]
 *           example: "medium"
 *         status:
 *           type: string
 *           description: 公告状态
 *           enum: [draft, published, expired]
 *           example: "published"
 *         isTop:
 *           type: boolean
 *           description: 是否置顶
 *           example: true
 *         publishTime:
 *           type: string
 *           format: date-time
 *           description: 发布时间
 *           example: "2024-01-16T10:00:00Z"
 *         expireTime:
 *           type: string
 *           format: date-time
 *           description: 过期时间
 *           example: "2024-01-21T10:00:00Z"
 *
 *     AnnouncementList:
 *       type: object
 *       properties:
 *         success:
 *           type: boolean
 *           example: true
 *         data:
 *           type: object
 *           properties:
 *             announcements:
 *               type: array
 *               items:
 *                 $ref: '#/components/schemas/Announcement'
 *             total:
 *               type: integer
 *               description: 总记录数
 *               example: 50
 *             page:
 *               type: integer
 *               description: 当前页码
 *               example: 1
 *             limit:
 *               type: integer
 *               description: 每页数量
 *               example: 10
 *             totalPages:
 *               type: integer
 *               description: 总页数
 *               example: 5
 *
 *     AnnouncementResponse:
 *       type: object
 *       properties:
 *         success:
 *           type: boolean
 *           example: true
 *         message:
 *           type: string
 *           example: "操作成功"
 *         data:
 *           $ref: '#/components/schemas/Announcement'
 *
 *     AnnouncementError:
 *       type: object
 *       properties:
 *         success:
 *           type: boolean
 *           example: false
 *         message:
 *           type: string
 *           example: "操作失败"
 *         error:
 *           type: string
 *           example: "公告不存在"
 */