feat(school,classes): 学校/年级/班级模块审计修复 — 权限校验 + i18n + 架构图同步

- 新增审计报告 docs/architecture/audit/school-grade-class-audit-report.md

- 修复 P0-4: teacher/classes 4 个页面补充 requirePermission 权限校验

- 修复 P0-5: 新增 school.json i18n 文件（zh-CN/en）并接入 schools-view 组件

- 同步架构图 004：补充 grade-management 死模块记录与 teacher/classes 权限修复说明

src/app/(dashboard)/teacher/classes/my/page.tsx

@@ -1,10 +1,13 @@
 import type { JSX } from "react"
+import { requirePermission } from "@/shared/lib/auth-guard"
+import { Permissions } from "@/shared/types/permissions"
 import { getClassSubjects, getTeacherClasses } from "@/modules/classes/data-access"
 import { MyClassesGrid } from "@/modules/classes/components/my-classes-grid"
 
 export const dynamic = "force-dynamic"
 
 export default async function MyClassesPage(): Promise<JSX.Element> {
+  await requirePermission(Permissions.CLASS_READ)
   const [classes, subjectOptions] = await Promise.all([getTeacherClasses(), getClassSubjects()])
 
   return (