feat: add Node.js/Express API with real data from Desk CRM

- ✅ API completa em /api com TypeScript
- ✅ Google Calendar integration (pessoal + profissional)
- ✅ Queries diretas à BD: tasks, leads, projectos, billing, pipeline
- ✅ Endpoints: /api/dashboard, /api/monitor, /api/health
- ✅ Vite proxy configurado (/api → localhost:3001)
- ✅ App.tsx usa /api/dashboard (não mais dados mock)
- ✅ Migração completa do PHP (index.php + monitor.php)
- ✅ CHANGELOG.md criado para tracking
- ✅ Scripts npm: dev (paralelo), dev:api, dev:ui, start

Dependencies:
- express, cors, mysql2, googleapis
- concurrently, tsx (dev)

Breaking: PHP backend será descontinuado
See: CHANGELOG.md, api/README.md

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

api/routes/monitor.ts

@@ -0,0 +1,22 @@
+/**
+ * Monitor API Route
+ * GET /api/monitor
+ * @author Descomplicar® | @link descomplicar.pt | @copyright 2026
+ */
+import { Router } from 'express'
+import type { Request, Response } from 'express'
+import * as monitoringService from '../services/monitoring.js'
+
+const router = Router()
+
+router.get('/', async (req: Request, res: Response) => {
+  try {
+    const data = await monitoringService.getMonitoringData()
+    res.json(data)
+  } catch (error) {
+    console.error('Monitor API error:', error)
+    res.status(500).json({ error: 'Internal server error' })
+  }
+})
+
+export default router