refactor!: 模块化拆分 src 结构，新增批量同步服务、查询解析器及前端分页/高级检索功能

- src/ 按 clients/services/api 分层，Config 提升至 crate 根
- 新增 batch_sync.rs（双源并行收割）、query_parser.rs（多平台检索式转换）
- build.rs 自动触发前端 npm install & build
- SearchPanel 支持分页/排序/每页条数/高级检索构建器，前端加入搜索缓存
- 新增 SyncPanel 替换 SettingsPanel；新增 live_search 集成测试

dashboard/src/components/layout/Sidebar.tsx

@@ -1,10 +1,10 @@
 // dashboard/src/components/layout/Sidebar.tsx
-import { Search, BookOpen, GitFork, Library, Settings } from 'lucide-react';
+import { Search, BookOpen, GitFork, Library, RefreshCw } from 'lucide-react';
 import type { StandardPaper } from '../../types';
 
 interface SidebarProps {
-  activeTab: 'search' | 'library' | 'reader' | 'citation' | 'settings';
-  setActiveTab: (tab: 'search' | 'library' | 'reader' | 'citation' | 'settings') => void;
+  activeTab: 'search' | 'library' | 'reader' | 'citation' | 'sync';
+  setActiveTab: (tab: 'search' | 'library' | 'reader' | 'citation' | 'sync') => void;
   selectedPaper: StandardPaper | null;
   loadCitations: (bibcode: string) => void;
 }
@@ -29,9 +29,9 @@ export function Sidebar({ activeTab, setActiveTab, selectedPaper, loadCitations
           {[
             { id: 'search', label: '统一检索', icon: Search },
             { id: 'library', label: '馆藏管理', icon: Library },
+            { id: 'sync', label: '批量同步', icon: RefreshCw },
             { id: 'reader', label: '双语阅读', icon: BookOpen, disabled: !selectedPaper },
             { id: 'citation', label: '引用星系', icon: GitFork, disabled: !selectedPaper },
-            { id: 'settings', label: '系统设置', icon: Settings },
           ].map(tab => {
             const Icon = tab.icon;
             const isActive = activeTab === tab.id;