fix: 全部TS错误修复(25->0) + 证书API 500修复 + i18n缺失key补全 + 类型定义修正

- 证书API 500修复: AssessmentCertificate实体注册到app.module.ts
- 前端TS错误25个清零: i18n key 17个, 类型定义8个
- i18n补全: 17个缺失key添加到zh/en/ja
- KnowledgeFile类型: 添加title, content字段
- importService: 改用apiClient.request替代raw fetch
- ModeSelector: 移除jsx prop
- questionBankService: .ok -> .status >= 400
- NotebookDetailView: .filter -> .items.filter
- ImportTasksDrawer: tasks.items提取
- API端点审计: 16/16通过
- 数据库Schema审计: 25表288列一致
- AGENTS.md更新

web/components/views/NotebookDetailView.tsx

@@ -63,7 +63,7 @@ export const NotebookDetailView: React.FC<NotebookDetailViewProps> = ({ authToke
         setIsLoading(true)
         try {
             const allFiles = await knowledgeBaseService.getAll(authToken)
-            const notebookFiles = allFiles.filter(f => f.groups?.some(g => g.id === notebook.id))
+            const notebookFiles = allFiles.items.filter(f => f.groups?.some(g => g.id === notebook.id))
             setFiles(notebookFiles)
         } catch (error) {
             console.error(error)