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/ja-JP.json

@@ -0,0 +1,10 @@
+{
+  "dateTime": "%x %a %X",
+  "date": "%Y/%m/%d",
+  "time": "%H:%M:%S",
+  "periods": ["AM", "PM"],
+  "days": ["日曜日", "月曜日", "火曜日", "水曜日", "木曜日", "金曜日", "土曜日"],
+  "shortDays": ["日", "月", "火", "水", "木", "金", "土"],
+  "months": ["1月", "2月", "3月", "4月", "5月", "6月", "7月", "8月", "9月", "10月", "11月", "12月"],
+  "shortMonths": ["1月", "2月", "3月", "4月", "5月", "6月", "7月", "8月", "9月", "10月", "11月", "12月"]
+}