refactor: 迁移 UI 组件库从 Ant Design 至 TDesign

- 替换 antd 为 tdesign-react 作为主要 UI 组件库
- 引入 Recharts 替代 @ant-design/charts 实现图表功能
- 移除主题系统相关代码（ThemeContext、themes 目录）
- 更新所有组件以适配 TDesign 组件 API
- 更新测试用例以匹配新的组件实现
- 新增 TDesign 和 Recharts 集成规范文档

frontend/src/__tests__/setup.ts

@@ -5,7 +5,7 @@ if (typeof window === 'undefined' || typeof document === 'undefined') {
   throw new Error('jsdom environment not initialized. Check vitest config.');
 }
 
-// Polyfill window.matchMedia for jsdom (required by antd)
+// Polyfill window.matchMedia for jsdom (required by TDesign)
 Object.defineProperty(window, 'matchMedia', {
   writable: true,
   value: (query: string) => ({
@@ -30,10 +30,26 @@ window.getComputedStyle = (elt: Element, pseudoElt?: string | null) => {
   }
 };
 
-// Polyfill ResizeObserver for antd
+// Polyfill ResizeObserver for TDesign
 global.ResizeObserver = class ResizeObserver {
   observe() {}
   unobserve() {}
   disconnect() {}
 };
 
+// Suppress TDesign Form internal act() warnings
+// These warnings come from TDesign's FormItem component internal async state updates
+// They don't affect test reliability - all tests pass successfully
+const originalError = console.error;
+console.error = (...args: unknown[]) => {
+  const message = args[0];
+  // Filter out TDesign FormItem act() warnings
+  if (
+    typeof message === 'string' &&
+    message.includes('An update to FormItem inside a test was not wrapped in act(...)')
+  ) {
+    return;
+  }
+  originalError(...args);
+};
+