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/lucide-react/dist/esm/createLucideIcon.js

@@ -0,0 +1,37 @@
+/**
+ * @license lucide-react v0.303.0 - ISC
+ *
+ * This source code is licensed under the ISC license.
+ * See the LICENSE file in the root directory of this source tree.
+ */
+
+import { forwardRef, createElement } from 'react';
+import defaultAttributes from './defaultAttributes.js';
+
+const toKebabCase = (string) => string.replace(/([a-z0-9])([A-Z])/g, "$1-$2").toLowerCase().trim();
+const createLucideIcon = (iconName, iconNode) => {
+  const Component = forwardRef(
+    ({ color = "currentColor", size = 24, strokeWidth = 2, absoluteStrokeWidth, className = "", children, ...rest }, ref) => createElement(
+      "svg",
+      {
+        ref,
+        ...defaultAttributes,
+        width: size,
+        height: size,
+        stroke: color,
+        strokeWidth: absoluteStrokeWidth ? Number(strokeWidth) * 24 / Number(size) : strokeWidth,
+        className: ["lucide", `lucide-${toKebabCase(iconName)}`, className].join(" "),
+        ...rest
+      },
+      [
+        ...iconNode.map(([tag, attrs]) => createElement(tag, attrs)),
+        ...Array.isArray(children) ? children : [children]
+      ]
+    )
+  );
+  Component.displayName = `${iconName}`;
+  return Component;
+};
+
+export { createLucideIcon as default, toKebabCase };
+//# sourceMappingURL=createLucideIcon.js.map