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/next.js

@@ -0,0 +1,35 @@
+var toArray = require('./toArray');
+
+/**
+ * Gets the next value on a wrapped object following the
+ * [iterator protocol](https://mdn.io/iteration_protocols#iterator).
+ *
+ * @name next
+ * @memberOf _
+ * @since 4.0.0
+ * @category Seq
+ * @returns {Object} Returns the next iterator value.
+ * @example
+ *
+ * var wrapped = _([1, 2]);
+ *
+ * wrapped.next();
+ * // => { 'done': false, 'value': 1 }
+ *
+ * wrapped.next();
+ * // => { 'done': false, 'value': 2 }
+ *
+ * wrapped.next();
+ * // => { 'done': true, 'value': undefined }
+ */
+function wrapperNext() {
+  if (this.__values__ === undefined) {
+    this.__values__ = toArray(this.value());
+  }
+  var done = this.__index__ >= this.__values__.length,
+      value = done ? undefined : this.__values__[this.__index__++];
+
+  return { 'done': done, 'value': value };
+}
+
+module.exports = wrapperNext;