feat(front): 项目/会议管理 admin 端补齐 + 删除按钮 + 级联 UI + 角色劳务组件

admin 会议管理:
- 新建 admin/AdminMeetings.vue (查看/删除/批量删除, 面包屑 首页/项目管理/会议管理)
- AdminLayout.vue 加 /admin/meetings 菜单
- router/index.js 加 admin-meetings + admin-meetings-detail 路由
- MeetingDetail.vue admin 删除按钮改 admin+manager 双角色可触发 (onAdminDelete 跳回按角色)

manager 会议管理:
- Meetings.vue 加批量删除 + 删除按钮 + 删除确认文案 (6 张表级联)
- MeetingDetail.vue 删除按钮 v-if 改 canDeleteMeeting = isAdmin || isManager

manager 项目管理:
- Projects.vue 加批量删除 + 删除项 + doDelete 改走 cascade (5 张项目表 + 会议链)
- ProjectsNew.vue style-alignment: page-card 居左 (max-width 1200px, 无 margin auto), form-actions 包在 el-form 内
- Projects.vue + Meetings.vue + AdminMeetings.vue 删页内冗余删除提示

store + 组件:
- store/user.js 加 isAdmin getter
- components/ProjectRoleSelect.vue 新建 (项目级角色劳务下拉, 接 roleLabor)

ry-vue3/src/router/index.js

@@ -26,6 +26,8 @@ const routes = [
       { path: 'users', name: 'admin-users', component: () => import('@/views/admin/Users.vue'), meta: { title: '用户管理' } },
       { path: 'roles', name: 'admin-roles', component: () => import('@/views/admin/Roles.vue'), meta: { title: '角色管理' } },
       { path: 'projects', name: 'admin-projects', component: () => import('@/views/manager/Projects.vue'), meta: { title: '项目管理' } },
+      { path: 'meetings', name: 'admin-meetings', component: () => import('@/views/admin/AdminMeetings.vue'), meta: { title: '会议管理' } },
+      { path: 'meetings/detail/:meetingId', name: 'admin-meetings-detail', component: () => import('@/views/manager/MeetingDetail.vue'), meta: { title: '会议详情' } },
       { path: 'department', name: 'admin-department', component: () => import('@/views/admin/Department.vue'), meta: { title: '科室管理' } },
       { path: 'title', name: 'admin-title', component: () => import('@/views/admin/Title.vue'), meta: { title: '职称管理' } },
       { path: 'experts', name: 'admin-experts', component: () => import('@/views/expert/Experts.vue'), meta: { title: '专家管理' } },