fix(desktop): console.log 清理 — 替换为结构化 logger

将 desktop/src 中 23 处 console.log 替换为 createLogger() 结构化日志:
- 生产构建自动静默 debug/info 级别
- 保留 console.error 用于关键错误可见性
- 新增 dompurify 依赖修复 XSS 防护引入缺失

涉及文件: App.tsx, offlineStore.ts, autonomy-manager.ts,
gateway-auth.ts, llm-service.ts, request-helper.ts,
security-index.ts, skill-discovery.ts, use-onboarding.ts 等 16 个文件

desktop/src/lib/gateway-auth.ts

@@ -12,6 +12,9 @@ import {
   getDeviceKeys,
   deleteDeviceKeys,
 } from './secure-storage';
+import { createLogger } from './logger';
+
+const log = createLogger('GatewayAuth');
 
 // === Types ===
 
@@ -81,7 +84,7 @@ export async function loadDeviceKeys(): Promise<DeviceKeys> {
         publicKeyBase64: b64Encode(storedKeys.publicKey),
       };
     } catch (e) {
-      console.warn('[GatewayClient] Failed to load stored keys:', e);
+      log.warn('Failed to load stored keys:', e);
       // Invalid stored keys, clear and regenerate
       await deleteDeviceKeys();
     }
@@ -113,9 +116,9 @@ export async function getLocalDeviceIdentity(): Promise<LocalDeviceIdentity> {
 export async function clearDeviceKeys(): Promise<void> {
   try {
     await deleteDeviceKeys();
-    console.log('[GatewayClient] Device keys cleared');
+    log.debug('Device keys cleared');
   } catch (e) {
-    console.warn('[GatewayClient] Failed to clear device keys:', e);
+    log.warn('Failed to clear device keys:', e);
   }
 }