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/recharts/es6/shape/Dot.js

@@ -0,0 +1,24 @@
+function _extends() { _extends = Object.assign ? Object.assign.bind() : function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; }; return _extends.apply(this, arguments); }
+/**
+ * @fileOverview Dot
+ */
+import * as React from 'react';
+import clsx from 'clsx';
+import { adaptEventHandlers } from '../util/types';
+import { filterProps } from '../util/ReactUtils';
+export var Dot = function Dot(props) {
+  var cx = props.cx,
+    cy = props.cy,
+    r = props.r,
+    className = props.className;
+  var layerClass = clsx('recharts-dot', className);
+  if (cx === +cx && cy === +cy && r === +r) {
+    return /*#__PURE__*/React.createElement("circle", _extends({}, filterProps(props, false), adaptEventHandlers(props), {
+      className: layerClass,
+      cx: cx,
+      cy: cy,
+      r: r
+    }));
+  }
+  return null;
+};