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/@vitest/snapshot/dist/environment-cMiGIVXz.d.ts

@@ -0,0 +1,14 @@
+interface SnapshotEnvironment {
+    getVersion: () => string;
+    getHeader: () => string;
+    resolvePath: (filepath: string) => Promise<string>;
+    resolveRawPath: (testPath: string, rawPath: string) => Promise<string>;
+    saveSnapshotFile: (filepath: string, snapshot: string) => Promise<void>;
+    readSnapshotFile: (filepath: string) => Promise<string | null>;
+    removeSnapshotFile: (filepath: string) => Promise<void>;
+}
+interface SnapshotEnvironmentOptions {
+    snapshotsDirName?: string;
+}
+
+export type { SnapshotEnvironment as S, SnapshotEnvironmentOptions as a };