docs(textbooks): 新增教材模块审计报告并同步架构图

- 新增 docs/architecture/audit/textbooks-audit-report.md，覆盖三层架构、权限、i18n、类型安全、错误边界、组件复用、a11y、可测试性、性能、安全等维度的审计，并给出 P0/P1/P2 改进优先级与重构方案要点

- 同步 004 架构影响地图 §2.5：修正 actions/data-access 行数与导出函数名（移除不存在的读 Action，补充 reorderChaptersAction），补充跨模块 UI 依赖、已知问题清单

- 同步 005 架构数据 JSON：补充 getKnowledgePointOptions 跨模块接口、uiDeps、knownIssues、auditReport 字段，修正 getTextbooks/getTextbookById 的 usedBy 以包含学生端页面

docs/architecture/005_architecture_data.json

@@ -4076,14 +4076,16 @@
             "name": "getTextbooks",
             "signature": "(query?, subject?, grade?) => Promise<Textbook[]>",
             "usedBy": [
-              "teacher/textbooks/page.tsx"
+              "teacher/textbooks/page.tsx",
+              "student/learning/textbooks/page.tsx"
             ]
           },
           {
             "name": "getTextbookById",
             "signature": "(id) => Promise<Textbook | undefined>",
             "usedBy": [
-              "teacher/textbooks/[id]/page.tsx"
+              "teacher/textbooks/[id]/page.tsx",
+              "student/learning/textbooks/[id]/page.tsx"
             ]
           },
           {
@@ -4194,6 +4196,14 @@
             "usedBy": [
               "dashboard/data-access.getAdminDashboardData"
             ]
+          },
+          {
+            "name": "getKnowledgePointOptions",
+            "signature": "() => Promise<KnowledgePointOption[]>",
+            "purpose": "跨模块接口：获取所有知识点选项(含章节/教材信息)，供 questions 模块调用",
+            "usedBy": [
+              "questions/data-access.getKnowledgePointOptions"
+            ]
           }
         ],
         "hooks": [
@@ -4350,7 +4360,29 @@
             "name": "TextbookSettingsDialog",
             "purpose": "教材设置对话框"
           }
-        ]
+        ],
+        "uiDeps": [
+          {
+            "from": "textbooks/components/knowledge-point-dialogs.tsx",
+            "to": "questions/components/create-question-dialog",
+            "status": "P0 待解耦（直接 import 跨模块业务组件，应改为 props/Context 注入）",
+            "auditRef": "audit/textbooks-audit-report.md §2.1.1"
+          }
+        ],
+        "knownIssues": [
+          "P0 跨模块 UI 依赖：knowledge-point-dialogs.tsx 直接 import questions 模块 CreateQuestionDialog",
+          "P0 前端权限硬编码：canEdit={true} 按路由写死，未用 usePermission().hasPermission()",
+          "P0 全模块零 i18n：中英文文案硬编码，未接入 next-intl",
+          "P1 Server Action 未校验资源归属（chapterId 是否属于 textbookId）",
+          "P1 data-access 缺数据范围过滤（学生端未按年级过滤）",
+          "P1 缺 Error Boundary（无 error.tsx）",
+          "P1 知识点列表/弹窗重复实现（knowledge-point-panel.tsx 无调用方）",
+          "P1 学科/年级选项硬编码三处且彼此不一致",
+          "P1 纯逻辑未导出，零单测",
+          "P2 类型断言：chapter-sidebar-list.tsx 用 ! 、knowledge-graph.tsx 用 as+!",
+          "P2 删除确认不一致：textbook-settings-dialog 用 confirm()，其余用 AlertDialog"
+        ],
+        "auditReport": "audit/textbooks-audit-report.md"
       }
     },
     "classes": {