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/services/financial.ts

@@ -0,0 +1,113 @@
+/**
+ * Financial Queries Service
+ * @author Descomplicar® | @link descomplicar.pt | @copyright 2026
+ */
+import db from '../db.js'
+import type { RowDataPacket } from 'mysql2'
+
+export async function getFinancialData() {
+  const [
+    [vendasMes],
+    [vendasAno],
+    [despesasMes],
+    [despesasAno],
+    categorias,
+    evolucaoReceitas,
+    evolucaoDespesas,
+  ] = await Promise.all([
+    // Vendas mes actual (facturas nao-draft, nao-canceladas)
+    db.query<RowDataPacket[]>(`
+      SELECT COALESCE(SUM(total), 0) as valor
+      FROM tblinvoices
+      WHERE YEAR(date) = YEAR(CURDATE()) AND MONTH(date) = MONTH(CURDATE())
+        AND status NOT IN (1, 5)
+    `),
+
+    // Vendas acumuladas ano
+    db.query<RowDataPacket[]>(`
+      SELECT COALESCE(SUM(total), 0) as valor
+      FROM tblinvoices
+      WHERE YEAR(date) = YEAR(CURDATE()) AND status NOT IN (1, 5)
+    `),
+
+    // Despesas mes actual
+    db.query<RowDataPacket[]>(`
+      SELECT COALESCE(SUM(amount), 0) as valor
+      FROM tblexpenses
+      WHERE YEAR(date) = YEAR(CURDATE()) AND MONTH(date) = MONTH(CURDATE())
+    `),
+
+    // Despesas acumuladas ano
+    db.query<RowDataPacket[]>(`
+      SELECT COALESCE(SUM(amount), 0) as valor
+      FROM tblexpenses
+      WHERE YEAR(date) = YEAR(CURDATE())
+    `),
+
+    // Distribuicao por categoria
+    db.query<RowDataPacket[]>(`
+      SELECT ec.name as categoria, ROUND(SUM(e.amount), 2) as total
+      FROM tblexpenses e
+      LEFT JOIN tblexpenses_categories ec ON e.category = ec.id
+      WHERE YEAR(e.date) = YEAR(CURDATE())
+      GROUP BY e.category, ec.name
+      ORDER BY total DESC
+    `),
+
+    // Evolucao mensal receitas (ultimos 12 meses)
+    db.query<RowDataPacket[]>(`
+      SELECT DATE_FORMAT(date, '%Y-%m') as mes, ROUND(SUM(total), 2) as valor
+      FROM tblinvoices
+      WHERE status NOT IN (1, 5) AND date >= DATE_SUB(CURDATE(), INTERVAL 12 MONTH)
+      GROUP BY mes ORDER BY mes
+    `),
+
+    // Evolucao mensal despesas (ultimos 12 meses)
+    db.query<RowDataPacket[]>(`
+      SELECT DATE_FORMAT(date, '%Y-%m') as mes, ROUND(SUM(amount), 2) as valor
+      FROM tblexpenses
+      WHERE date >= DATE_SUB(CURDATE(), INTERVAL 12 MONTH)
+      GROUP BY mes ORDER BY mes
+    `),
+  ])
+
+  const vendas_mes = Math.round((vendasMes[0]?.valor || 0) * 100) / 100
+  const vendas_ano = Math.round((vendasAno[0]?.valor || 0) * 100) / 100
+  const despesas_mes = Math.round((despesasMes[0]?.valor || 0) * 100) / 100
+  const despesas_ano = Math.round((despesasAno[0]?.valor || 0) * 100) / 100
+  const lucro_mes = Math.round((vendas_mes - despesas_mes) * 100) / 100
+  const lucro_ano = Math.round((vendas_ano - despesas_ano) * 100) / 100
+
+  // Build monthly evolution map
+  const mesesMap = new Map<string, { receita: number; despesa: number }>()
+  for (const r of evolucaoReceitas[0] as RowDataPacket[]) {
+    mesesMap.set(r.mes, { receita: r.valor, despesa: 0 })
+  }
+  for (const d of evolucaoDespesas[0] as RowDataPacket[]) {
+    const existing = mesesMap.get(d.mes) || { receita: 0, despesa: 0 }
+    existing.despesa = d.valor
+    mesesMap.set(d.mes, existing)
+  }
+
+  const evolucao = Array.from(mesesMap.entries())
+    .sort(([a], [b]) => a.localeCompare(b))
+    .map(([mes, vals]) => ({
+      mes,
+      receita: vals.receita,
+      despesa: vals.despesa,
+    }))
+
+  return {
+    vendas_mes,
+    vendas_ano,
+    despesas_mes,
+    despesas_ano,
+    lucro_mes,
+    lucro_ano,
+    categorias: (categorias[0] as RowDataPacket[]).map(c => ({
+      name: c.categoria || 'Sem categoria',
+      value: c.total,
+    })),
+    evolucao,
+  }
+}