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/lz-string/typings/lz-string.d.ts

@@ -0,0 +1,14 @@
+export function compressToBase64(input: string): string;
+export function decompressFromBase64(input: string): string;
+
+export function compressToUTF16(input: string): string;
+export function decompressFromUTF16(compressed: string): string;
+
+export function compressToUint8Array(uncompressed: string): Uint8Array;
+export function decompressFromUint8Array(compressed: Uint8Array): string;
+
+export function compressToEncodedURIComponent(input: string): string;
+export function decompressFromEncodedURIComponent(compressed: string): string;
+
+export function compress(input: string): string;
+export function decompress(compressed: string): string;