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/jiti/dist/jiti.d.ts

@@ -0,0 +1,20 @@
+import { Module } from "module";
+import { TransformOptions, JITIOptions, JITIImportOptions } from "./types";
+export type { JITIOptions, TransformOptions } from "./types";
+type Require = typeof require;
+type Module = typeof module;
+type ModuleCache = Record<string, Module>;
+export type EvalModuleOptions = Partial<{
+    id: string;
+    filename: string;
+    ext: string;
+    cache: ModuleCache;
+}>;
+export interface JITI extends Require {
+    transform: (opts: TransformOptions) => string;
+    register: () => () => void;
+    evalModule: (source: string, options?: EvalModuleOptions) => unknown;
+    /** @experimental Behavior of `jiti.import` might change in the future. */
+    import: (id: string, importOptions: JITIImportOptions) => Promise<unknown>;
+}
+export default function createJITI(_filename: string, opts?: JITIOptions, parentModule?: Module, parentCache?: ModuleCache): JITI;