feat(courseware,docs): 完善课件传输与岛编辑并统一全仓文档

- 增加课件上传、班级可见范围、设备补收与传输进度
- 整合自定义灵动岛编辑器和相关客户端交互
- 同步三端契约、数据库迁移、部署配置与隔离回归
- 按源码统一文档与官网说明，移除过时任务书和审查记录
- 保持产品版本为 1.4.0

packages/desktop-client/src/renderer/router/index.ts

@@ -18,6 +18,7 @@ const routes: RouteRecordRaw[] = [
     component: () => import('../layouts/ClientLayout.vue'),
     redirect: '/schedule',
     children: [
+      { path: 'courseware', name: 'courseware', component: () => import('../views/CoursewareView.vue'), meta: { title: '课件' } },
       {
         path: 'schedule',
         name: 'schedule',