feat: WordPress Monitor API + Site Availability Checker

- Add POST /api/wp-monitor endpoint for WP plugin data
- Add GET /api/wp-monitor for listing monitored sites
- Add checkSiteAvailability() function for HTTP health checks
- Add checkAllSitesAvailability() for batch checking
- Add /api/scripts/check-sites.ts for cron execution
- Add POST /api/monitor/check-sites for manual trigger

DeskCRM Task: #1556

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

api/routes/monitor.ts

@@ -1,6 +1,7 @@
 /**
  * Monitor API Route
- * GET /api/monitor
+ * GET /api/monitor - Get all monitoring data
+ * POST /api/monitor/check-sites - Trigger site availability check
  * @author Descomplicar® | @link descomplicar.pt | @copyright 2026
  */
 import { Router } from 'express'
@@ -9,6 +10,7 @@ import * as monitoringService from '../services/monitoring.js'
 
 const router = Router()
 
+// Get monitoring data
 router.get('/', async (req: Request, res: Response) => {
   try {
     const data = await monitoringService.getMonitoringData()
@@ -19,4 +21,21 @@ router.get('/', async (req: Request, res: Response) => {
   }
 })
 
+// Trigger site availability check
+router.post('/check-sites', async (req: Request, res: Response) => {
+  try {
+    console.log('[Monitor] Manual site check triggered')
+    const result = await monitoringService.checkAllSitesAvailability()
+    res.json({
+      success: true,
+      message: 'Site check completed',
+      ...result,
+      timestamp: new Date().toISOString()
+    })
+  } catch (error) {
+    console.error('Site check error:', error)
+    res.status(500).json({ error: 'Internal server error', message: (error as Error).message })
+  }
+})
+
 export default router