refactor(frontend): Replace console.log with logger utility - Sprint 3 Story 1

Replace all console.log/warn/error statements with unified logger utility.

Changes:
- Replaced console in lib/hooks/use-stories.ts
- Replaced console in lib/signalr/SignalRContext.tsx
- Replaced console in lib/hooks/useProjectHub.ts
- Replaced console in lib/hooks/use-tasks.ts
- Replaced console in lib/hooks/useNotificationHub.ts
- Replaced console in lib/hooks/use-projects.ts
- Replaced console in app/(dashboard)/projects/[id]/kanban/page.tsx

Logger respects NODE_ENV (debug disabled in production).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

lib/hooks/useNotificationHub.ts

@@ -4,6 +4,7 @@ import { useEffect, useState, useCallback, useRef } from 'react';
 import { SignalRConnectionManager } from '@/lib/signalr/ConnectionManager';
 import { SIGNALR_CONFIG } from '@/lib/signalr/config';
 import { useAuthStore } from '@/stores/authStore';
+import { logger } from '@/lib/utils/logger';
 
 export interface Notification {
   message: string;
@@ -32,14 +33,14 @@ export function useNotificationHub() {
 
     // 监听通知事件
     manager.on('Notification', (notification: Notification) => {
-      console.log('[NotificationHub] Received notification:', notification);
+      logger.debug('[NotificationHub] Received notification:', notification);
       setNotifications((prev) => [notification, ...prev].slice(0, 50)); // 保留最近 50 条
     });
 
     manager.on(
       'NotificationRead',
       (data: { NotificationId: string; ReadAt: string }) => {
-        console.log('[NotificationHub] Notification read:', data);
+        logger.debug('[NotificationHub] Notification read:', data);
       }
     );
 
@@ -58,7 +59,7 @@ export function useNotificationHub() {
     try {
       await managerRef.current.invoke('MarkAsRead', notificationId);
     } catch (error) {
-      console.error(
+      logger.error(
         '[NotificationHub] Error marking notification as read:',
         error
       );