feat(frontend): add API client, layout, and routing

- Create Axios-based API client with sources, jobs, and dashboard endpoints
- Add responsive Layout component with navigation sidebar
- Set up React Router with Dashboard, Backups, and Settings routes
- Configure TanStack Query provider with default options
- Use lucide-react for navigation icons

frontend/node_modules/d3-time-format/locale/pt-BR.json

@@ -0,0 +1,10 @@
+{
+  "dateTime": "%A, %e de %B de %Y. %X",
+  "date": "%d/%m/%Y",
+  "time": "%H:%M:%S",
+  "periods": ["AM", "PM"],
+  "days": ["Domingo", "Segunda", "Terça", "Quarta", "Quinta", "Sexta", "Sábado"],
+  "shortDays": ["Dom", "Seg", "Ter", "Qua", "Qui", "Sex", "Sáb"],
+  "months": ["Janeiro", "Fevereiro", "Março", "Abril", "Maio", "Junho", "Julho", "Agosto", "Setembro", "Outubro", "Novembro", "Dezembro"],
+  "shortMonths": ["Jan", "Fev", "Mar", "Abr", "Mai", "Jun", "Jul", "Ago", "Set", "Out", "Nov", "Dez"]
+}