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/zh-CN.json

@@ -0,0 +1,10 @@
+{
+  "dateTime": "%x %A %X",
+  "date": "%Y年%-m月%-d日",
+  "time": "%H:%M:%S",
+  "periods": ["上午", "下午"],
+  "days": ["星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"],
+  "shortDays": ["周日", "周一", "周二", "周三", "周四", "周五", "周六"],
+  "months": ["一月", "二月", "三月", "四月", "五月", "六月", "七月", "八月", "九月", "十月", "十一月", "十二月"],
+  "shortMonths": ["一月", "二月", "三月", "四月", "五月", "六月", "七月", "八月", "九月", "十月", "十一月", "十二月"]
+}