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/dom-accessibility-api/dist/is-disabled.d.ts

@@ -0,0 +1,10 @@
+/**
+ * Check if an element is disabled
+ * https://www.w3.org/TR/html-aam-1.0/#html-attribute-state-and-property-mappings
+ * https://www.w3.org/TR/wai-aria-1.1/#aria-disabled
+ *
+ * @param element
+ * @returns {boolean} true if disabled, otherwise false
+ */
+export declare function isDisabled(element: Element): boolean;
+//# sourceMappingURL=is-disabled.d.ts.map