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/server.ts

@@ -8,6 +8,8 @@ import cors from 'cors'
 import dashboardRouter from './routes/dashboard.js'
 import monitorRouter from './routes/monitor.js'
 import diagnosticRouter from './routes/diagnostic.js'
+import hetznerRouter from './routes/hetzner.js'
+import wpMonitorRouter from './routes/wp-monitor.js'
 
 const app = express()
 const PORT = process.env.API_PORT || 3001
@@ -28,6 +30,8 @@ app.get('/api/health', (req, res) => {
 app.use('/api/dashboard', dashboardRouter)
 app.use('/api/monitor', monitorRouter)
 app.use('/api/diagnostic', diagnosticRouter)
+app.use('/api/hetzner', hetznerRouter)
+app.use('/api/wp-monitor', wpMonitorRouter)
 
 // Error handling
 app.use((err: any, req: express.Request, res: express.Response, next: express.NextFunction) => {
@@ -42,5 +46,6 @@ app.listen(PORT, () => {
   console.log(`📊 Dashboard: http://localhost:${PORT}/api/dashboard`)
   console.log(`🔍 Monitor: http://localhost:${PORT}/api/monitor`)
   console.log(`🔧 Diagnostic: http://localhost:${PORT}/api/diagnostic`)
+  console.log(`☁️  Hetzner: http://localhost:${PORT}/api/hetzner`)
   console.log('='.repeat(50))
 })