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/exams/[id]/build/page.tsx

@@ -1,5 +1,6 @@
 import type { JSX } from "react"
 import { notFound } from "next/navigation"
+import { getTranslations } from "next-intl/server"
 import { ExamAssembly } from "@/modules/exams/components/exam-assembly"
 import { getExamById } from "@/modules/exams/data-access"
 import { getQuestions } from "@/modules/questions/data-access"
@@ -9,40 +10,14 @@ import type { ExamNode } from "@/modules/exams/components/assembly/selected-ques
 import { createId } from "@paralleldrive/cuid2"
 import { requirePermission } from "@/shared/lib/auth-guard"
 import { Permissions } from "@/shared/types/permissions"
-import {
-  AiClientProvider,
-  type AiClientService,
-} from "@/modules/ai/context/ai-client-provider"
-import {
-  aiChatAction,
-  suggestSimilarQuestionsAction,
-  suggestGradingAction,
-  generateLessonContentAction,
-  generateQuestionVariantAction,
-  analyzeWeaknessAction,
-} from "@/modules/ai/actions"
+import { AiClientProvider } from "@/modules/ai/context/ai-client-provider"
+import { createCoreAiClientService } from "@/modules/ai/context/create-ai-client-service"
 
 export const dynamic = "force-dynamic"
 
-/**
- * 构建 AI 客户端服务（Server Action 引用集合）
- *
- * 通过 React Context 注入，客户端组件不直接 import actions，
- * 遵循依赖注入模式，便于测试时替换为 mock。
- */
-function createAiClientService(): AiClientService {
-  return {
-    chat: aiChatAction,
-    suggestSimilarQuestions: suggestSimilarQuestionsAction,
-    suggestGrading: suggestGradingAction,
-    generateLessonContent: generateLessonContentAction,
-    generateQuestionVariant: generateQuestionVariantAction,
-    analyzeWeakness: analyzeWeaknessAction,
-  }
-}
-
 export default async function BuildExamPage({ params }: { params: Promise<{ id: string }> }): Promise<JSX.Element> {
   const { id } = await params
+  const t = await getTranslations("examHomework.exam.build")
 
   const ctx = await requirePermission(Permissions.EXAM_READ)
   const exam = await getExamById(id, ctx.dataScope)
@@ -101,14 +76,14 @@ export default async function BuildExamPage({ params }: { params: Promise<{ id:
     }))
   }
 
-  const aiClientService = createAiClientService()
+  const aiClientService = createCoreAiClientService()
 
   return (
     <AiClientProvider service={aiClientService}>
       <div className="flex h-full flex-col space-y-4 p-4">
         <div>
-          <h1 className="text-2xl font-bold tracking-tight">Build Exam</h1>
-          <p className="text-muted-foreground">Assemble questions for your exam.</p>
+          <h1 className="text-2xl font-bold tracking-tight">{t("title")}</h1>
+          <p className="text-muted-foreground">{t("description")}</p>
         </div>
         <ExamAssembly
           examId={exam.id}