feat(dashboard,diagnostic,elective): add widgets, layout, parent dashboard, role-config, services, elective components

dashboard:

- Add comparison-badge, dashboard-notification-widget, dashboard-responsive-layout, dashboard-time-range-filter

- Add parent-dashboard components directory

- Add config, hooks, and services directories

diagnostic:

- Add role-config and services directory

elective:

- Add elective-course-detail, elective-stats-cards, parent-selection-view components

- Add data-access-settings and data-access-stats

src/modules/dashboard/components/teacher-dashboard/teacher-dashboard-view.tsx

@@ -64,7 +64,7 @@ async function TeacherDashboardContent({ data }: { data: TeacherDashboardData &
         <TeacherDashboardHeader teacherName={data.teacherName} />
       </header>
 
-      <DashboardSection variant="stats">
+      <DashboardSection variant="stats" ariaLabel={t("sections.quickStats")}>
         <TeacherStats
           toGradeCount={metrics.toGradeCount}
           activeAssignmentsCount={metrics.activeAssignmentsCount}
@@ -76,19 +76,19 @@ async function TeacherDashboardContent({ data }: { data: TeacherDashboardData &
       <div className="flex flex-col gap-6 lg:grid lg:grid-cols-12">
         {/* 课表：移动端首位，桌面端右上 — 仅渲染一次（P2-9 修复，原为双实例） */}
         <div className="order-1 lg:col-start-9 lg:col-span-4 lg:row-start-1">
-          <DashboardSection variant="card">
+          <DashboardSection variant="card" ariaLabel={t("sections.todaySchedule")}>
             <TeacherSchedule items={metrics.todayScheduleItems} />
           </DashboardSection>
         </div>
 
         <section aria-label={t("sections.pendingGrading")} className="flex flex-col gap-6 order-2 lg:col-start-1 lg:col-span-8 lg:row-start-1 lg:row-span-2">
-          <DashboardSection variant="card">
+          <DashboardSection variant="card" ariaLabel={t("todo.title")}>
             <TeacherTodoCard items={todoItems} />
           </DashboardSection>
-          <DashboardSection variant="chart">
+          <DashboardSection variant="chart" ariaLabel={t("sections.gradeTrends")}>
             <TeacherGradeTrends trends={data.gradeTrends} />
           </DashboardSection>
-          <DashboardSection variant="list">
+          <DashboardSection variant="list" ariaLabel={t("sections.recentSubmissions")}>
             <RecentSubmissions
               submissions={metrics.submissionsToGrade}
               title={t("sections.pendingGrading")}
@@ -99,10 +99,10 @@ async function TeacherDashboardContent({ data }: { data: TeacherDashboardData &
         </section>
 
         <aside aria-label={t("sections.myClasses")} className="flex flex-col gap-6 order-3 lg:col-start-9 lg:col-span-4 lg:row-start-2">
-          <DashboardSection variant="list">
+          <DashboardSection variant="list" ariaLabel={t("sections.homework")}>
             <TeacherHomeworkCard assignments={data.assignments} />
           </DashboardSection>
-          <DashboardSection variant="list">
+          <DashboardSection variant="list" ariaLabel={t("sections.myClasses")}>
             <TeacherClassesCard classes={data.classes} />
           </DashboardSection>
         </aside>