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/camelcase-css/index-es5.js

@@ -0,0 +1,24 @@
+"use strict";
+
+var pattern = /-(\w|$)/g;
+
+var callback = function callback(dashChar, char) {
+	return char.toUpperCase();
+};
+
+var camelCaseCSS = function camelCaseCSS(property) {
+	property = property.toLowerCase();
+
+	// NOTE :: IE8's "styleFloat" is intentionally not supported
+	if (property === "float") {
+		return "cssFloat";
+	}
+	// Microsoft vendor-prefixes are uniquely cased
+	else if (property.charCodeAt(0) === 45&& property.charCodeAt(1) === 109&& property.charCodeAt(2) === 115&& property.charCodeAt(3) === 45) {
+			return property.substr(1).replace(pattern, callback);
+		} else {
+			return property.replace(pattern, callback);
+		}
+};
+
+module.exports = camelCaseCSS;