fix: API funcionando com dados reais + dotenv config

- Adiciona dotenv para carregar variáveis de ambiente
- Configura DB_HOST para servidor remoto (176.9.3.158)
- Cria endpoint /api/diagnostic para testes
- Actualiza título: "Plan EAL" → "Dashboard Descomplicar"
- Adiciona tsconfig.json para pasta /api
- Fix: Carrega .env antes de inicializar MySQL pool

Tarefa: #1556

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

api/server.ts

@@ -2,10 +2,12 @@
  * Express API Server
  * @author Descomplicar® | @link descomplicar.pt | @copyright 2026
  */
+import 'dotenv/config'
 import express from 'express'
 import cors from 'cors'
 import dashboardRouter from './routes/dashboard.js'
 import monitorRouter from './routes/monitor.js'
+import diagnosticRouter from './routes/diagnostic.js'
 
 const app = express()
 const PORT = process.env.API_PORT || 3001
@@ -25,6 +27,7 @@ app.get('/api/health', (req, res) => {
 // Routes
 app.use('/api/dashboard', dashboardRouter)
 app.use('/api/monitor', monitorRouter)
+app.use('/api/diagnostic', diagnosticRouter)
 
 // Error handling
 app.use((err: any, req: express.Request, res: express.Response, next: express.NextFunction) => {
@@ -34,7 +37,10 @@ app.use((err: any, req: express.Request, res: express.Response, next: express.Ne
 
 // Start server
 app.listen(PORT, () => {
+  console.log('='.repeat(50))
   console.log(`🚀 API Server running on http://localhost:${PORT}`)
   console.log(`📊 Dashboard: http://localhost:${PORT}/api/dashboard`)
   console.log(`🔍 Monitor: http://localhost:${PORT}/api/monitor`)
+  console.log(`🔧 Diagnostic: http://localhost:${PORT}/api/diagnostic`)
+  console.log('='.repeat(50))
 })