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/lodash/_baseConforms.js

@@ -0,0 +1,18 @@
+var baseConformsTo = require('./_baseConformsTo'),
+    keys = require('./keys');
+
+/**
+ * The base implementation of `_.conforms` which doesn't clone `source`.
+ *
+ * @private
+ * @param {Object} source The object of property predicates to conform to.
+ * @returns {Function} Returns the new spec function.
+ */
+function baseConforms(source) {
+  var props = keys(source);
+  return function(object) {
+    return baseConformsTo(object, source, props);
+  };
+}
+
+module.exports = baseConforms;