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/@testing-library/dom/dist/queries/text.js

@@ -0,0 +1,57 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.queryByText = exports.queryAllByText = exports.getByText = exports.getAllByText = exports.findByText = exports.findAllByText = void 0;
+var _queryHelpers = require("../query-helpers");
+var _helpers = require("../helpers");
+var _allUtils = require("./all-utils");
+const queryAllByText = (container, text, {
+  selector = '*',
+  exact = true,
+  collapseWhitespace,
+  trim,
+  ignore = (0, _allUtils.getConfig)().defaultIgnore,
+  normalizer
+} = {}) => {
+  (0, _helpers.checkContainerType)(container);
+  const matcher = exact ? _allUtils.matches : _allUtils.fuzzyMatches;
+  const matchNormalizer = (0, _allUtils.makeNormalizer)({
+    collapseWhitespace,
+    trim,
+    normalizer
+  });
+  let baseArray = [];
+  if (typeof container.matches === 'function' && container.matches(selector)) {
+    baseArray = [container];
+  }
+  return [...baseArray, ...Array.from(container.querySelectorAll(selector))]
+  // TODO: `matches` according lib.dom.d.ts can get only `string` but according our code it can handle also boolean :)
+  .filter(node => !ignore || !node.matches(ignore)).filter(node => matcher((0, _allUtils.getNodeText)(node), node, text, matchNormalizer));
+};
+const getMultipleError = (c, text) => `Found multiple elements with the text: ${text}`;
+const getMissingError = (c, text, options = {}) => {
+  const {
+    collapseWhitespace,
+    trim,
+    normalizer,
+    selector
+  } = options;
+  const matchNormalizer = (0, _allUtils.makeNormalizer)({
+    collapseWhitespace,
+    trim,
+    normalizer
+  });
+  const normalizedText = matchNormalizer(text.toString());
+  const isNormalizedDifferent = normalizedText !== text.toString();
+  const isCustomSelector = (selector ?? '*') !== '*';
+  return `Unable to find an element with the text: ${isNormalizedDifferent ? `${normalizedText} (normalized from '${text}')` : text}${isCustomSelector ? `, which matches selector '${selector}'` : ''}. This could be because the text is broken up by multiple elements. In this case, you can provide a function for your text matcher to make your matcher more flexible.`;
+};
+const queryAllByTextWithSuggestions = exports.queryAllByText = (0, _queryHelpers.wrapAllByQueryWithSuggestion)(queryAllByText, queryAllByText.name, 'queryAll');
+const [queryByText, getAllByText, getByText, findAllByText, findByText] = (0, _allUtils.buildQueries)(queryAllByText, getMultipleError, getMissingError);
+exports.findByText = findByText;
+exports.findAllByText = findAllByText;
+exports.getByText = getByText;
+exports.getAllByText = getAllByText;
+exports.queryByText = queryByText;