fix: serve static files in production

- Added static file serving in Express for production
- Added SPA fallback for client-side routing
- Created Dockerfile with NODE_ENV=production
- Frontend now properly served at dash.descomplicar.pt

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

api/server.ts

@@ -5,6 +5,8 @@
 import 'dotenv/config'
 import express from 'express'
 import cors from 'cors'
+import path from 'path'
+import { fileURLToPath } from 'url'
 import dashboardRouter from './routes/dashboard.js'
 import monitorRouter from './routes/monitor.js'
 import diagnosticRouter from './routes/diagnostic.js'
@@ -12,8 +14,12 @@ import hetznerRouter from './routes/hetzner.js'
 import wpMonitorRouter from './routes/wp-monitor.js'
 import serverMetricsRouter from './routes/server-metrics.js'
 
+const __filename = fileURLToPath(import.meta.url)
+const __dirname = path.dirname(__filename)
+
 const app = express()
 const PORT = process.env.API_PORT || 3001
+const isProduction = process.env.NODE_ENV === 'production'
 
 // Middleware
 app.use(cors({
@@ -35,6 +41,20 @@ app.use('/api/hetzner', hetznerRouter)
 app.use('/api/wp-monitor', wpMonitorRouter)
 app.use('/api/server-metrics', serverMetricsRouter)
 
+// Serve static files in production
+if (isProduction) {
+  const distPath = path.join(__dirname, '..', 'dist')
+  app.use(express.static(distPath))
+
+  // SPA fallback - serve index.html for all non-API routes
+  app.get('*', (req, res, next) => {
+    if (req.path.startsWith('/api')) {
+      return next()
+    }
+    res.sendFile(path.join(distPath, 'index.html'))
+  })
+}
+
 // Error handling
 app.use((err: any, _req: express.Request, res: express.Response, _next: express.NextFunction) => {
   console.error('Server error:', err)