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/local-pkg/dist/index.d.cts

@@ -0,0 +1,38 @@
+import { PackageJson } from 'pkg-types';
+
+interface PackageInfo {
+    name: string;
+    rootPath: string;
+    packageJsonPath: string;
+    version: string;
+    packageJson: PackageJson;
+}
+interface PackageResolvingOptions {
+    paths?: string[];
+    /**
+     * @default 'auto'
+     * Resolve path as posix or win32
+     */
+    platform?: 'posix' | 'win32' | 'auto';
+}
+declare function resolveModule(name: string, options?: PackageResolvingOptions): string | undefined;
+declare function importModule<T = any>(path: string): Promise<T>;
+declare function isPackageExists(name: string, options?: PackageResolvingOptions): boolean;
+declare function getPackageInfo(name: string, options?: PackageResolvingOptions): Promise<{
+    name: string;
+    version: string | undefined;
+    rootPath: string;
+    packageJsonPath: string;
+    packageJson: PackageJson;
+} | undefined>;
+declare function getPackageInfoSync(name: string, options?: PackageResolvingOptions): {
+    name: string;
+    version: string | undefined;
+    rootPath: string;
+    packageJsonPath: string;
+    packageJson: PackageJson;
+} | undefined;
+declare function loadPackageJSON(cwd?: string): Promise<PackageJson | null>;
+declare function isPackageListed(name: string, cwd?: string): Promise<boolean>;
+
+export { type PackageInfo, type PackageResolvingOptions, getPackageInfo, getPackageInfoSync, importModule, isPackageExists, isPackageListed, loadPackageJSON, resolveModule };