refactor: 前端 UI 框架从 TDesign 迁移到 antd 6.x

- 移除 tdesign-react + tdesign-icons-react，新增 antd@6.4.3 + @ant-design/icons@6.2.3
- Layout/Header/Sider/Content 替换 TDesign Layout，Sider 内置折叠管理
- Segmented 替换 RadioGroup 主题切换，ConfigProvider 主题算法切换
- Menu items prop 模式，Sidebar 简化为无 props 纯组件
- Table/Modal/Form/Input.TextArea/Tabs/Tag/Popconfirm 全量迁移
- App.useApp().message 替换 MessagePlugin（hooks 模式）
- --td-* CSS 变量替换为 --ant-* antd CSS 变量
- 测试适配：ConfigProvider+App wrapper，.ant-menu-item-selected，antd CSS-in-JS jsdom 兼容
- 文档更新：frontend.md, development/README.md, config.yaml, deploy.md
- vendor-antd chunk 755KB gzipped 240KB

tests/setup.ts

@@ -99,6 +99,14 @@ Object.defineProperty(dom.window, "customElements", {
 
 globalThis.customElements = dom.window.customElements;
 
+globalThis.ShadowRoot = class ShadowRoot extends dom.window.DocumentFragment {} as unknown as typeof ShadowRoot;
+globalThis.SVGElement = class SVGElement extends dom.window.Element {} as unknown as typeof SVGElement;
+globalThis.Selection = class Selection {
+  addRange() {}
+  removeAllRanges() {}
+} as unknown as typeof Selection;
+globalThis.Range = class Range extends dom.window.DocumentFragment {} as unknown as typeof Range;
+
 import { afterEach } from "bun:test";
 
 afterEach(() => {