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/tr-TR.json

@@ -0,0 +1,10 @@
+{
+  "dateTime": "%a %e %b %X %Y",
+  "date": "%d/%m/%Y",
+  "time": "%H:%M:%S",
+  "periods": ["AM", "PM"],
+  "days": ["Pazar", "Pazartesi", "Salı", "Çarşamba", "Perşembe", "Cuma", "Cumartesi"],
+  "shortDays": ["Paz", "Pzt", "Sal", "Çar", "Per", "Cum", "Cmt"],
+  "months": ["Ocak", "Şubat", "Mart", "Nisan", "Mayıs", "Haziran", "Temmuz", "Ağustos", "Eylül", "Ekim", "Kasım", "Aralık"],
+  "shortMonths": ["Oca", "Şub", "Mar", "Nis", "May", "Haz", "Tem", "Ağu", "Eyl", "Eki", "Kas", "Ara"]
+}