feat(app): add error/loading boundaries across all dashboard routes and new routes

- Add error.tsx and loading.tsx boundaries for admin, parent, student, teacher routes

- Add admin announcements edit, audit-logs overview, curriculum-map, invitation-codes, permissions, questions, roles routes

- Add admin elective detail and components, files, course-plans, users, scheduling boundaries

- Add messages group-compose route

- Add parent course-plans, elective, grades report-card, practice routes

- Add student course-plans, elective detail, error-book dialogs, grades report-card, learning study-path, leave, schedule boundaries

- Add teacher attendance report, classes boundaries, course-plans boundaries, elective, exams analytics/edit-rich/all/create/new, grades report-card, homework boundaries, leave, lesson-plans calendar

- Add auth loading, onboarding loading, api cron

src/app/(dashboard)/teacher/course-plans/[id]/error.tsx

@@ -0,0 +1,20 @@
+"use client"
+
+import { useTranslations } from "next-intl"
+import { ClipboardList } from "lucide-react"
+import { EmptyState } from "@/shared/components/ui/empty-state"
+
+export default function TeacherCoursePlanDetailError() {
+  const t = useTranslations("coursePlans")
+  return (
+    <div className="p-8">
+      <EmptyState
+        icon={ClipboardList}
+        title={t("errors.loadFailed")}
+        description={t("errors.loadFailedDesc")}
+        action={{ label: t("errors.retry"), onClick: () => window.location.reload() }}
+        className="border-none shadow-none"
+      />
+    </div>
+  )
+}

src/app/(dashboard)/teacher/course-plans/[id]/loading.tsx

@@ -0,0 +1,27 @@
+import { Skeleton } from "@/shared/components/ui/skeleton"
+
+export default function TeacherCoursePlanDetailLoading() {
+  return (
+    <div className="flex h-full flex-col space-y-6 p-8">
+      <div className="flex items-center justify-between">
+        <Skeleton className="h-8 w-[240px]" />
+        <div className="flex gap-2">
+          <Skeleton className="h-9 w-[80px]" />
+          <Skeleton className="h-9 w-[80px]" />
+        </div>
+      </div>
+      <Skeleton className="h-4 w-full max-w-md" />
+      <div className="grid gap-4 md:grid-cols-3">
+        {Array.from({ length: 3 }).map((_, i) => (
+          <Skeleton key={i} className="h-[100px] w-full" />
+        ))}
+      </div>
+      <div className="space-y-3">
+        <Skeleton className="h-10 w-full" />
+        {Array.from({ length: 4 }).map((_, i) => (
+          <Skeleton key={i} className="h-12 w-full" />
+        ))}
+      </div>
+    </div>
+  )
+}

src/app/(dashboard)/teacher/course-plans/[id]/page.tsx

@@ -13,9 +13,13 @@ export default async function TeacherCoursePlanDetailPage({
 }: {
   params: Promise<{ id: string }>
 }): Promise<JSX.Element> {
-  await requirePermission(Permissions.COURSE_PLAN_READ)
+  const ctx = await requirePermission(Permissions.COURSE_PLAN_READ)
   const { id } = await params
-  const plan = await getCoursePlanById(id)
+  // P0-1/P0-3：教师视角仅能查看自己负责的计划，避免信息泄露
+  const plan = await getCoursePlanById(
+    id,
+    { userId: ctx.userId, isAdmin: false, teacherId: ctx.userId }
+  )
 
   if (!plan) notFound()
 
@@ -24,6 +28,9 @@ export default async function TeacherCoursePlanDetailPage({
       <CoursePlanDetail
         plan={plan}
         backHref="/teacher/course-plans"
+        successHref="/teacher/course-plans"
+        textbooksHref="/teacher/textbooks"
+        homeworkHref="/teacher/homework"
       />
     </div>
   )