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/diagnostic/class/[classId]/error.tsx

@@ -1,6 +1,7 @@
 "use client"
 
 import { AlertCircle } from "lucide-react"
+import { useTranslations } from "next-intl"
 
 import { EmptyState } from "@/shared/components/ui/empty-state"
 
@@ -10,14 +11,15 @@ export default function DiagnosticClassError({
   error: Error & { digest?: string }
   reset: () => void
 }) {
+  const t = useTranslations("diagnostic")
   return (
     <div className="flex h-full flex-col items-center justify-center space-y-4 p-8">
       <EmptyState
         icon={AlertCircle}
-        title="班级学情诊断加载失败"
-        description="抱歉，加载班级诊断数据时发生了意外错误。请稍后重试。"
+        title={t("error.classLoadFailed")}
+        description={t("error.classLoadFailedDesc")}
         action={{
-          label: "重试",
+          label: t("error.retry"),
           onClick: () => reset(),
         }}
         className="border-none shadow-none h-auto"

src/app/(dashboard)/teacher/diagnostic/class/[classId]/page.tsx

@@ -1,11 +1,21 @@
 import type { JSX } from "react"
 import { notFound } from "next/navigation"
 import { Stethoscope } from "lucide-react"
+import { getTranslations } from "next-intl/server"
 import { requirePermission } from "@/shared/lib/auth-guard"
 import { Permissions } from "@/shared/types/permissions"
 import { getClassMasterySummary } from "@/modules/diagnostic/data-access"
 import { ClassDiagnosticView } from "@/modules/diagnostic/components/class-diagnostic-view"
-import { WidgetBoundary } from "@/modules/grades/components/widget-boundary"
+import {
+  DiagnosticServiceProvider,
+} from "@/modules/diagnostic/services/diagnostic-service-context"
+import { defaultDiagnosticService } from "@/modules/diagnostic/services/default-diagnostic-service"
+import { createMonitoredDiagnosticService } from "@/modules/diagnostic/services/monitored-diagnostic-service"
+import {
+  DiagnosticMonitorProvider,
+} from "@/modules/diagnostic/services/diagnostic-monitor-context"
+import { noopDiagnosticMonitor } from "@/modules/diagnostic/services/diagnostic-monitor"
+import { WidgetBoundary } from "@/shared/components/widget-boundary"
 
 export const dynamic = "force-dynamic"
 
@@ -16,6 +26,7 @@ export default async function ClassDiagnosticPage({
 }): Promise<JSX.Element> {
   const { classId } = await params
   const ctx = await requirePermission(Permissions.DIAGNOSTIC_READ)
+  const t = await getTranslations("diagnostic")
 
   // DataScope 校验：教师只能查看所教班级，学生/家长不可访问
   if (ctx.dataScope.type === "class_taught" && !ctx.dataScope.classIds.includes(classId)) {
@@ -31,19 +42,29 @@ export default async function ClassDiagnosticPage({
     notFound()
   }
 
+  // v2-P2-7: 包装默认服务以添加监控埋点（默认 no-op，生产环境可注入真实实现）
+  const monitoredService = createMonitoredDiagnosticService(
+    defaultDiagnosticService,
+    noopDiagnosticMonitor,
+  )
+
   return (
     <div className="h-full flex-1 flex-col space-y-8 p-8 md:flex">
       <div>
         <h1 className="flex items-center gap-2 text-2xl font-bold tracking-tight">
           <Stethoscope className="h-6 w-6" aria-hidden="true" />
-          Class Diagnostic
+          {t("title.teacherClass")}
         </h1>
         <p className="text-muted-foreground">
-          Class-level knowledge point mastery overview and student attention list.
+          {t("title.teacherClassDesc")}
         </p>
       </div>
-      <WidgetBoundary title="班级学情诊断" skeletonHeight={400}>
-        <ClassDiagnosticView summary={summary} />
+      <WidgetBoundary title={t("title.teacherClass")} skeletonHeight={400}>
+        <DiagnosticMonitorProvider monitor={noopDiagnosticMonitor}>
+          <DiagnosticServiceProvider service={monitoredService}>
+            <ClassDiagnosticView summary={summary} />
+          </DiagnosticServiceProvider>
+        </DiagnosticMonitorProvider>
       </WidgetBoundary>
     </div>
   )