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/request-helper.ts

@@ -7,6 +7,10 @@
  * @module lib/request-helper
  */
 
+import { createLogger } from './logger';
+
+const log = createLogger('RequestHelper');
+
 // === Configuration Types ===
 
 export interface RequestConfig {
@@ -161,8 +165,8 @@ export async function requestWithRetry(
         // Check if we should retry
         if (retryOn.includes(response.status) && attempt < retries) {
           const backoff = calculateBackoff(retryDelay, attempt);
-          console.warn(
-            `[RequestHelper] Request failed (${response.status}), ` +
+          log.warn(
+            `Request failed (${response.status}), ` +
             `retrying in ${backoff}ms (attempt ${attempt + 1}/${retries})`
           );
           await delay(backoff);
@@ -184,8 +188,8 @@ export async function requestWithRetry(
         // Check if we should retry
         if (error.isRetryable(retryOn) && attempt < retries) {
           const backoff = calculateBackoff(retryDelay, attempt);
-          console.warn(
-            `[RequestHelper] Request error (${error.status}), ` +
+          log.warn(
+            `Request error (${error.status}), ` +
             `retrying in ${backoff}ms (attempt ${attempt + 1}/${retries})`
           );
           await delay(backoff);
@@ -206,8 +210,8 @@ export async function requestWithRetry(
         // Retry on timeout
         if (attempt < retries) {
           const backoff = calculateBackoff(retryDelay, attempt);
-          console.warn(
-            `[RequestHelper] Request timed out, ` +
+          log.warn(
+            `Request timed out, ` +
             `retrying in ${backoff}ms (attempt ${attempt + 1}/${retries})`
           );
           await delay(backoff);
@@ -411,7 +415,7 @@ export class RequestManager {
   cancelAll(): void {
     this.controllers.forEach((controller, id) => {
       controller.abort();
-      console.log(`[RequestManager] Cancelled request: ${id}`);
+      log.debug(`Cancelled request: ${id}`);
     });
     this.controllers.clear();
     this.requestConfigs.clear();