feat: 双模式集成并精简 API 文档/Token、设置页卡片自适应

- 源/仓库各自可在直连(FTP/SFTP、MySQL)与 Metrix 存储/数据库平台间独立选择，两侧互不依赖
- Metrix 模式下源走平台储存 API、仓库走平台导入 + run-script(single_session)、查看导出代理到平台
- 去掉对外 API 文档与 API Token（前后端 + auth/config 解耦），业务接口仅登录态可访问
- 授权默认到期日改为 2026-12-30
- 设置页卡片改横向自适应（宽屏并排、窄屏换行），处理历史保留卡片收窄

frontend/src/AppShell.vue

@@ -122,7 +122,6 @@ import { useMessage, type DropdownOption, type MenuOption, NIcon } from 'naive-u
 import {
   ChevronDownOutline,
   CloudUploadOutline,
-  CodeSlashOutline,
   ConstructOutline,
   FileTrayFullOutline,
   LogOutOutline,
@@ -147,7 +146,7 @@ const loginLoading = ref(false);
 const sidebarCollapsed = ref(localStorage.getItem('sidebarCollapsed') === 'true');
 const licenseModalVisible = ref(false);
 const brandClickCount = ref(0);
-const menuKeys = ['workflow', 'history', 'database', 'script', 'api-center', 'settings'] as const;
+const menuKeys = ['workflow', 'history', 'database', 'script', 'settings'] as const;
 type MenuKey = (typeof menuKeys)[number];
 let brandClickResetTimer: number | undefined;
 
@@ -156,7 +155,6 @@ const menuOptions: MenuOption[] = [
   { label: '处理历史', key: 'history', icon: renderIcon(FileTrayFullOutline) },
   { label: '数据管理', key: 'database', icon: renderIcon(ServerOutline) },
   { label: '脚本编辑', key: 'script', icon: renderIcon(ConstructOutline) },
-  { label: 'API 文档', key: 'api-center', icon: renderIcon(CodeSlashOutline) },
   { label: '系统设置', key: 'settings', icon: renderIcon(SettingsOutline) }
 ];