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/useProposalNotifications.ts

@@ -14,6 +14,9 @@
 import { useEffect, useRef, useCallback } from 'react';
 import { useChatStore } from '../store/chatStore';
 import { intelligenceClient, type IdentityChangeProposal } from './intelligence-client';
+import { createLogger } from './logger';
+
+const log = createLogger('ProposalNotifications');
 
 // Configuration
 const POLL_INTERVAL_MS = 60_000; // 1 minute
@@ -109,7 +112,7 @@ export function useProposalNotifications(): {
         saveNotifiedProposals(notifiedProposalsRef.current);
       }
     } catch (err) {
-      console.warn('[ProposalNotifications] Failed to check proposals:', err);
+      log.warn('Failed to check proposals:', err);
     } finally {
       isPollingRef.current = false;
     }
@@ -164,7 +167,7 @@ export function ProposalNotificationHandler(): null {
       const { count } = customEvent.detail;
 
       // You can integrate with a toast system here
-      console.log(`[ProposalNotifications] ${count} new proposal(s) available`);
+      log.debug(`${count} new proposal(s) available`);
 
       // If using the Toast system from Toast.tsx, you would do:
       // toast(`${count} 个新的人格变更提案待审批`, 'info');