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/react-hook-form/dist/useFormControlContext.d.ts

@@ -0,0 +1,12 @@
+import React from 'react';
+import type { Control, FieldValues } from './types';
+/**
+ * Separate context for `control` to prevent unnecessary rerenders.
+ * Internal hooks that only need control use this instead of full form context.
+ */
+export declare const HookFormControlContext: React.Context<Control | null>;
+/**
+ * @internal Internal hook to access only control from context.
+ */
+export declare const useFormControlContext: <TFieldValues extends FieldValues, TContext = any, TTransformedValues = TFieldValues>() => Control<TFieldValues, TContext, TTransformedValues>;
+//# sourceMappingURL=useFormControlContext.d.ts.map