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/page.tsx

@@ -1,24 +1,15 @@
 import type { JSX } from "react"
+import { getTranslations } from "next-intl/server"
+
 import { requirePermission } from "@/shared/lib/auth-guard"
 import { Permissions } from "@/shared/types/permissions"
 import { getParam, type SearchParams } from "@/shared/lib/search-params"
 import { getCoursePlans } from "@/modules/course-plans/data-access"
 import { CoursePlanList } from "@/modules/course-plans/components/course-plan-list"
-import type { CoursePlanStatus } from "@/modules/course-plans/types"
+import { isCoursePlanStatus } from "@/modules/course-plans/types"
 
 export const dynamic = "force-dynamic"
 
-const VALID_STATUSES: ReadonlySet<string> = new Set([
-  "planning",
-  "active",
-  "completed",
-  "paused",
-])
-
-function parseStatus(v?: string): CoursePlanStatus | undefined {
-  return v && VALID_STATUSES.has(v) ? (v as CoursePlanStatus) : undefined
-}
-
 export default async function TeacherCoursePlansPage({
   searchParams,
 }: {
@@ -27,21 +18,25 @@ export default async function TeacherCoursePlansPage({
   const ctx = await requirePermission(Permissions.COURSE_PLAN_READ)
   const teacherId = ctx.userId
 
+  const t = await getTranslations("coursePlans")
   const sp = await searchParams
   const statusParam = getParam(sp, "status")
-  const status = parseStatus(statusParam)
+  // P1-4：使用类型守卫替代 as 断言
+  const status = isCoursePlanStatus(statusParam) ? statusParam : undefined
 
+  // P0-3：data-access 按教师范围过滤
   const plans = teacherId
-    ? await getCoursePlans({ teacherId, status })
+    ? await getCoursePlans(
+        { teacherId, status },
+        { userId: teacherId, isAdmin: false, teacherId }
+      )
     : []
 
   return (
     <div className="flex h-full flex-col space-y-8 p-8">
       <div className="space-y-1">
-        <h1 className="text-2xl font-bold tracking-tight">My Course Plans</h1>
-        <p className="text-muted-foreground">
-          View your course teaching plans and weekly schedules.
-        </p>
+        <h1 className="text-2xl font-bold tracking-tight">{t("teacher.title")}</h1>
+        <p className="text-muted-foreground">{t("teacher.description")}</p>
       </div>
       <CoursePlanList
         plans={plans}