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/grades/stats/page.tsx

@@ -10,6 +10,7 @@ import { requirePermission } from "@/shared/lib/auth-guard"
 import { Permissions } from "@/shared/types/permissions"
 import { getParam, type SearchParams } from "@/shared/lib/search-params"
 import { BarChart3 } from "lucide-react"
+import { getTranslations } from "next-intl/server"
 
 export const dynamic = "force-dynamic"
 
@@ -20,6 +21,7 @@ export default async function StatsPage({
 }): Promise<JSX.Element> {
   const ctx = await requirePermission(Permissions.GRADE_RECORD_READ)
   const sp = await searchParams
+  const t = await getTranslations("grades")
 
   const classId = getParam(sp, "classId")
   const subjectId = getParam(sp, "subjectId")
@@ -33,12 +35,12 @@ export default async function StatsPage({
     return (
       <div className="h-full flex-1 flex-col space-y-8 p-8 md:flex">
         <div>
-          <h1 className="text-2xl font-bold tracking-tight">Grade Statistics</h1>
-          <p className="text-muted-foreground">View class grade statistics and rankings.</p>
+          <h1 className="text-2xl font-bold tracking-tight">{t("title.stats")}</h1>
+          <p className="text-muted-foreground">{t("page.stats.description")}</p>
         </div>
         <EmptyState
-          title="No classes"
-          description="You don't have any classes yet."
+          title={t("page.stats.noClassesTitle")}
+          description={t("page.stats.noClassesDescription")}
           icon={BarChart3}
           className="border-none shadow-none"
         />
@@ -57,12 +59,12 @@ export default async function StatsPage({
     return (
       <div className="h-full flex-1 flex-col space-y-8 p-8 md:flex">
         <div>
-          <h1 className="text-2xl font-bold tracking-tight">Grade Statistics</h1>
-          <p className="text-muted-foreground">View class grade statistics and rankings.</p>
+          <h1 className="text-2xl font-bold tracking-tight">{t("title.stats")}</h1>
+          <p className="text-muted-foreground">{t("page.stats.description")}</p>
         </div>
         <EmptyState
-          title="No accessible classes"
-          description="You don't have permission to view any classes."
+          title={t("page.stats.noAccessTitle")}
+          description={t("page.stats.noAccessDescription")}
           icon={BarChart3}
           className="border-none shadow-none"
         />
@@ -98,14 +100,14 @@ export default async function StatsPage({
     <div className="h-full flex-1 flex-col space-y-8 p-8 md:flex">
       <div className="flex items-center justify-between">
         <div>
-          <h1 className="text-2xl font-bold tracking-tight">Grade Statistics</h1>
-          <p className="text-muted-foreground">View class grade statistics and rankings.</p>
+          <h1 className="text-2xl font-bold tracking-tight">{t("title.stats")}</h1>
+          <p className="text-muted-foreground">{t("page.stats.description")}</p>
         </div>
         <ExportButton
           classId={targetClassId}
           subjectId={targetSubjectId}
           variant="outline"
-          label="导出成绩"
+          label={t("page.stats.exportLabel")}
         />
       </div>