feat: add financial panel, compact services list, add Syncthing

- New /financial page with sales/expenses cards, monthly bar chart and
  expense distribution pie chart (Recharts)
- New API endpoint GET /api/financial with queries on tblinvoices and
  tblexpenses
- Compact services grid (2-col dots layout) in Monitor page
- Add Syncthing to critical services monitoring
- Add Financeiro nav link to Dashboard, Monitor and Financial headers

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

api/server.ts

@@ -13,6 +13,7 @@ import diagnosticRouter from './routes/diagnostic.js'
 import hetznerRouter from './routes/hetzner.js'
 import wpMonitorRouter from './routes/wp-monitor.js'
 import serverMetricsRouter from './routes/server-metrics.js'
+import financialRouter from './routes/financial.js'
 import { collectAllServerMetrics } from './services/server-metrics.js'
 
 const __filename = fileURLToPath(import.meta.url)
@@ -41,6 +42,7 @@ app.use('/api/diagnostic', diagnosticRouter)
 app.use('/api/hetzner', hetznerRouter)
 app.use('/api/wp-monitor', wpMonitorRouter)
 app.use('/api/server-metrics', serverMetricsRouter)
+app.use('/api/financial', financialRouter)
 
 // Serve static files in production
 if (isProduction) {