feat(security): 新增桌面端应用锁

新增 4 位 PIN、手动锁定、启动锁定和系统闲置锁定。

新增主进程与 preload 能力、桌面端设置面板、全局锁屏覆盖层及四语言界面。

Fixes #190

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

apps/desktop/preload/apis/security.ts

@@ -0,0 +1,18 @@
+import { ipcRenderer } from 'electron'
+import type { SecurityApi } from '../../shared/types'
+
+export const securityApi: SecurityApi = {
+  getConfig: () => ipcRenderer.invoke('app-lock:getConfig'),
+  getState: () => ipcRenderer.invoke('app-lock:getState'),
+  lock: () => ipcRenderer.invoke('app-lock:lock'),
+  unlock: (password) => ipcRenderer.invoke('app-lock:unlock', password),
+  setPassword: (password) => ipcRenderer.invoke('app-lock:setPassword', password),
+  changePassword: (oldPassword, newPassword) => ipcRenderer.invoke('app-lock:changePassword', oldPassword, newPassword),
+  resetPassword: () => ipcRenderer.invoke('app-lock:resetPassword'),
+  updateConfig: (updates) => ipcRenderer.invoke('app-lock:updateConfig', updates),
+  onLockStateChanged: (callback) => {
+    const handler = (_event: Electron.IpcRendererEvent, locked: boolean) => callback(locked)
+    ipcRenderer.on('app-lock-state-changed', handler)
+    return () => ipcRenderer.removeListener('app-lock-state-changed', handler)
+  },
+}