feat(auth): 添加认证模块和图片批注功能（项目初始化）

- 实现用户登录、登出、密码修改等认证功能
- 添加会话管理和权限控制中间件
- 创建图片批注组件和相关API路由
- 实现批注的增删改查功能
- 添加Docker和Git忽略配置文件
- 创建系统架构文档和开发约定说明
- 集成认证模块到前端应用路由中

api/repositories/annotationsRepository.ts

@@ -0,0 +1,16 @@
+import { database } from '../database.js';
+import type { Annotation, CreateAnnotationRequest } from '../../shared/types.js';
+
+type AnnotationRow = Annotation & { id: number | string; image_id: number | string };
+function toAnnotation(row: AnnotationRow): Annotation { return { ...row, id: Number(row.id), image_id: Number(row.image_id) }; }
+
+export const annotationsRepository = {
+  async listByImage(imageId: number): Promise<Annotation[]> {
+    return (await database.all<AnnotationRow>('SELECT id, image_id, x, y, content, author_name, status, created_at FROM annotations WHERE image_id = ? ORDER BY id ASC', [imageId])).map(toAnnotation);
+  },
+  async create(imageId: number, data: CreateAnnotationRequest): Promise<Annotation> {
+    const id = await database.insertId('INSERT INTO annotations (image_id, x, y, content, author_name) VALUES (?, ?, ?, ?, ?)', [imageId, data.x, data.y, data.content, data.author_name || '客户']);
+    return toAnnotation((await database.one<AnnotationRow>('SELECT id, image_id, x, y, content, author_name, status, created_at FROM annotations WHERE id = ?', [id]))!);
+  },
+  async remove(id: number): Promise<boolean> { return (await database.execute('DELETE FROM annotations WHERE id = ?', [id])).changes > 0; },
+};