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/lesson-plans/new/page.tsx

@@ -5,6 +5,8 @@ import { ArrowLeft } from "lucide-react"
 import { getTranslations } from "next-intl/server"
 import { Button } from "@/shared/components/ui/button"
 import { Skeleton } from "@/shared/components/ui/skeleton"
+import { requirePermission } from "@/shared/lib/auth-guard"
+import { Permissions } from "@/shared/types/permissions"
 import { TemplatePicker } from "@/modules/lesson-preparation/components/template-picker"
 import { LessonPlanProviderSetup } from "@/modules/lesson-preparation/providers/lesson-plan-provider-setup"
 
@@ -12,6 +14,8 @@ export const dynamic = "force-dynamic"
 
 export default async function NewLessonPlanPage(): Promise<JSX.Element> {
   const t = await getTranslations("lessonPreparation")
+  // V4 P0-2 修复：页面层补齐 requirePermission 权限校验
+  await requirePermission(Permissions.LESSON_PLAN_READ)
   return (
     <div className="p-6">
       <div className="mb-6 flex items-center gap-4">