refactor: CSS 拆分 + auth 持久化提取 + 目录整理

- globals.css 拆分为 4 文件：tokens.css（颜色）/ transitions.css（过渡）/ base.css（重置）/ globals.css（入口）
- 提取 auth-persistence.ts 到 services/，解除 AppProvider→pages/login/hooks 反向依赖
- use-auth-state.ts 精简为纯 React Hook，持久化逻辑委托给 services/auth-persistence.ts
- components/common/ → components/ui/（目录名语义更清晰）
- TypeScript + Vite 构建通过

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/components/PageDispatcher.tsx

@@ -12,7 +12,7 @@
 import {useState, useEffect, useCallback, useRef, type ComponentType} from 'react';
 import {Modal, Drawer} from 'antd';
 import {on, off, EVENTS} from '@/utils/event-bus';
-import {FloatingPanel} from '@/components/common/FloatingPanel';
+import {FloatingPanel} from '@/components/ui/FloatingPanel';
 import {ComplianceAssetsPage} from '@/pages/compliance-assets/ComplianceAssetsPage';
 import {AccountPage} from '@/pages/account/AccountPage';
 import {VipPage} from '@/pages/vip/VipPage';