新增：Markdown编辑器/数据库优化/安全修复

- Markdown 编辑器：实时预览、PDF 导出、独立查看器
- 数据库优化：动态连接池、查询缓存、Redis Pipeline
- 窗口置顶功能
- 文件系统增强：右键菜单、编辑器集成、收藏夹重构
- 安全修复：XSS 防护、路径穿越、HTML 注入
- 代码质量：正则预编译、缓存锁优化、死代码清理

web/src/App.vue

@@ -20,6 +20,13 @@
               </template>
             </a-button>
           </a-tooltip>
+          <a-tooltip :content="isPinned ? '取消置顶' : '窗口置顶'">
+            <a-button type="text" :class="{ 'pin-active': isPinned }" @click="handleTogglePin">
+              <template #icon>
+                <IconPushpin :class="{ pinned: isPinned }"/>
+              </template>
+            </a-button>
+          </a-tooltip>
           <ThemeToggle/>
 
           <!-- 窗口控制按钮 -->
@@ -71,9 +78,10 @@
   </a-layout>
 </template>
 
-<script setup>
+<script setup lang="ts">
 import {computed, onMounted, onUnmounted, ref, watch} from 'vue'
-import {IconSettings} from '@arco-design/web-vue/es/icon'
+import {IconSettings, IconPushpin} from '@arco-design/web-vue/es/icon'
+import MarkdownEditor from './views/markdown-editor/index.vue'
 import DbCli from './views/db-cli/index.vue'
 import ThemeToggle from './components/ThemeToggle.vue'
 import FileSystem from './components/FileSystem/index.vue'
@@ -81,7 +89,6 @@ import SettingsPanel from './components/SettingsPanel.vue'
 import UpdateNotification from './components/UpdateNotification.vue'
 import {useUpdateStore} from './stores/update'
 import {useConfigStore} from './stores/config'
-import {preloadCommonLanguages} from './utils/codeMirrorLoader'
 
 // 存储键
 const ACTIVE_TAB_STORAGE_KEY = 'app-active-tab'
@@ -91,6 +98,7 @@ const savedTab = localStorage.getItem(ACTIVE_TAB_STORAGE_KEY)
 const activeTab = ref((savedTab === 'user' ? 'file-system' : savedTab) || 'file-system')
 const showSettings = ref(false)
 const isMaximized = ref(false)
+const isPinned = ref(false)
 
 // 使用 stores
 const updateStore = useUpdateStore()
@@ -129,21 +137,27 @@ const loadConfig = async () => {
 const getComponent = (key) => {
   const components = {
     'file-system': FileSystem,
-    'db-cli': DbCli
+    'db-cli': DbCli,
+    'markdown-editor': MarkdownEditor
   }
   return components[key] || null
 }
 
 // 组件挂载时加载配置
+// 禁止 Ctrl+滚轮缩放
+const preventZoom = (e: WheelEvent) => {
+  if (e.ctrlKey) e.preventDefault()
+}
+
 onMounted(() => {
   loadConfig()
 
-  // 预加载常用编辑器语言包
-  preloadCommonLanguages()
-
   // 设置更新事件监听
   updateStore.setupEventListeners()
 
+  // 禁止 Ctrl+滚轮缩放
+  document.addEventListener('wheel', preventZoom, { passive: false })
+
   // 延迟检查更新（启动后 3 秒，静默模式）
   setTimeout(() => {
     updateStore.checkForUpdates(true)
@@ -152,6 +166,7 @@ onMounted(() => {
 
 // 组件卸载时清理事件监听
 onUnmounted(() => {
+  document.removeEventListener('wheel', preventZoom)
   updateStore.removeEventListeners()
 })
 
@@ -166,6 +181,16 @@ const handleMinimize = async () => {
   }
 }
 
+const handleTogglePin = async () => {
+  try {
+    if (window.go?.main?.App?.WindowToggleAlwaysOnTop) {
+      isPinned.value = await window.go.main.App.WindowToggleAlwaysOnTop()
+    }
+  } catch (error) {
+    console.error('切换置顶失败:', error)
+  }
+}
+
 const handleMaximize = async () => {
   try {
     if (window.go?.main?.App?.WindowMaximize) {
@@ -282,6 +307,25 @@ watch(activeTab, (newTab) => {
   color: #ffffff;
 }
 
+.pin-active {
+  color: rgb(var(--primary-6)) !important;
+}
+
+.pin-active :deep(svg) {
+  transform: none !important;
+  opacity: 1 !important;
+}
+
+.header-actions :deep(.arco-icon-pushpin) {
+  transform: rotate(45deg);
+  opacity: 0.6;
+}
+
+.header-actions :deep(.arco-icon-pushpin.pinned) {
+  transform: none;
+  opacity: 1;
+}
+
 .window-control-btn svg {
   display: block;
   pointer-events: none;