refactor(school,classes): 完成 school/grade/class 审计全量改进项

P0-1/P0-2: 删除 grade-management 死模块，年级 CRUD 统一由 school 模块负责

P0-3: classes/actions.ts 从 974 行拆分为 6 个职责文件 + barrel re-export

P0-5: 13 个页面 i18n 全量接入（grades/departments/academic-year/classes/insights）

P1-1: 角色硬编码改为 hasAdminScope/hasTeacherScope/hasStudentScope 基于 dataScope.type

P1-3: 新增 SchoolErrorBoundary + SchoolListSkeleton/SchoolCardSkeleton，4 个页面包裹 Error Boundary

P1-4: classes/types.ts 跨领域类型添加归属决策注释

P1-5: schools-view.tsx 拆分为组合模式（SchoolFormDialog + SchoolDeleteDialog + SchoolListToolbar）

P1-6: 新增 getSchoolsForUser/getGradesForUser 权限感知查询函数

P2-1: 抽取 useSchoolData hook，对话框状态管理与 UI 分离

同步更新架构图文档 004/005

docs/architecture/005_architecture_data.json

@@ -5459,6 +5459,63 @@
             "updateAdminClass",
             "deleteAdminClass"
           ]
+        },
+        {
+          "path": "actions.ts",
+          "lines": 50,
+          "description": "Barrel re-export（P0-3 修复：从 974 行拆分为 6 个职责文件）",
+          "exports": [
+            "createTeacherClassAction",
+            "updateTeacherClassAction",
+            "deleteTeacherClassAction",
+            "createAdminClassAction",
+            "updateAdminClassAction",
+            "deleteAdminClassAction",
+            "createGradeClassAction",
+            "updateGradeClassAction",
+            "deleteGradeClassAction",
+            "enrollStudentByEmailAction",
+            "joinClassByInvitationCodeAction",
+            "ensureClassInvitationCodeAction",
+            "regenerateClassInvitationCodeAction",
+            "createClassInvitationCodeAction",
+            "revokeClassInvitationCodeAction",
+            "listClassInvitationCodesAction",
+            "setStudentEnrollmentStatusAction",
+            "createClassScheduleItemAction",
+            "updateClassScheduleItemAction",
+            "deleteClassScheduleItemAction"
+          ]
+        },
+        {
+          "path": "actions-teacher.ts",
+          "lines": 100,
+          "description": "教师班级 CRUD（3 个 Action，P0-3 修复）"
+        },
+        {
+          "path": "actions-admin.ts",
+          "lines": 120,
+          "description": "管理员班级 CRUD（3 个 Action，P0-3 修复）"
+        },
+        {
+          "path": "actions-grade.ts",
+          "lines": 110,
+          "description": "年级组长班级 CRUD（3 个 Action，P0-3 修复）"
+        },
+        {
+          "path": "actions-invitations.ts",
+          "lines": 280,
+          "description": "邀请码与注册（8 个 Action，P0-3 修复）"
+        },
+        {
+          "path": "actions-schedule.ts",
+          "lines": 90,
+          "description": "班级课表 CRUD（3 个 Action，P0-3 修复）"
+        },
+        {
+          "path": "actions-shared.ts",
+          "lines": 60,
+          "description": "共享工具（hasAdminScope/hasTeacherScope/hasStudentScope/parseSubjectTeachers/toWeekday，P1-1 修复）"
         }
       ]
     },