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/entities/dist/commonjs/generated/decode-data-xml.js

@@ -0,0 +1,10 @@
+"use strict";
+// Generated using scripts/write-decode-map.ts
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.xmlDecodeTree = void 0;
+exports.xmlDecodeTree = new Uint16Array(
+// prettier-ignore
+/* #__PURE__ */ "\u0200aglq\t\x15\x18\x1b\u026d\x0f\0\0\x12p;\u4026os;\u4027t;\u403et;\u403cuot;\u4022"
+    .split("")
+    .map((c) => c.charCodeAt(0)));
+//# sourceMappingURL=decode-data-xml.js.map