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/server.ts

@@ -0,0 +1,40 @@
+/**
+ * Express API Server
+ * @author Descomplicar® | @link descomplicar.pt | @copyright 2026
+ */
+import express from 'express'
+import cors from 'cors'
+import dashboardRouter from './routes/dashboard.js'
+import monitorRouter from './routes/monitor.js'
+
+const app = express()
+const PORT = process.env.API_PORT || 3001
+
+// Middleware
+app.use(cors({
+  origin: process.env.FRONTEND_URL || 'http://localhost:5173',
+  credentials: true
+}))
+app.use(express.json())
+
+// Health check
+app.get('/api/health', (req, res) => {
+  res.json({ status: 'ok', timestamp: new Date().toISOString() })
+})
+
+// Routes
+app.use('/api/dashboard', dashboardRouter)
+app.use('/api/monitor', monitorRouter)
+
+// Error handling
+app.use((err: any, req: express.Request, res: express.Response, next: express.NextFunction) => {
+  console.error('Server error:', err)
+  res.status(500).json({ error: 'Internal server error' })
+})
+
+// Start server
+app.listen(PORT, () => {
+  console.log(`🚀 API Server running on http://localhost:${PORT}`)
+  console.log(`📊 Dashboard: http://localhost:${PORT}/api/dashboard`)
+  console.log(`🔍 Monitor: http://localhost:${PORT}/api/monitor`)
+})