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/@tanstack/react-query/build/modern/useBaseQuery.cjs

@@ -0,0 +1,130 @@
+"use strict";
+"use client";
+var __create = Object.create;
+var __defProp = Object.defineProperty;
+var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
+var __getOwnPropNames = Object.getOwnPropertyNames;
+var __getProtoOf = Object.getPrototypeOf;
+var __hasOwnProp = Object.prototype.hasOwnProperty;
+var __export = (target, all) => {
+  for (var name in all)
+    __defProp(target, name, { get: all[name], enumerable: true });
+};
+var __copyProps = (to, from, except, desc) => {
+  if (from && typeof from === "object" || typeof from === "function") {
+    for (let key of __getOwnPropNames(from))
+      if (!__hasOwnProp.call(to, key) && key !== except)
+        __defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
+  }
+  return to;
+};
+var __toESM = (mod, isNodeMode, target) => (target = mod != null ? __create(__getProtoOf(mod)) : {}, __copyProps(
+  // If the importer is in node compatibility mode or this is not an ESM
+  // file that has been converted to a CommonJS file using a Babel-
+  // compatible transform (i.e. "__esModule" has not been set), then set
+  // "default" to the CommonJS "module.exports" for node compatibility.
+  isNodeMode || !mod || !mod.__esModule ? __defProp(target, "default", { value: mod, enumerable: true }) : target,
+  mod
+));
+var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);
+
+// src/useBaseQuery.ts
+var useBaseQuery_exports = {};
+__export(useBaseQuery_exports, {
+  useBaseQuery: () => useBaseQuery
+});
+module.exports = __toCommonJS(useBaseQuery_exports);
+var React = __toESM(require("react"), 1);
+var import_query_core = require("@tanstack/query-core");
+var import_QueryClientProvider = require("./QueryClientProvider.cjs");
+var import_QueryErrorResetBoundary = require("./QueryErrorResetBoundary.cjs");
+var import_errorBoundaryUtils = require("./errorBoundaryUtils.cjs");
+var import_IsRestoringProvider = require("./IsRestoringProvider.cjs");
+var import_suspense = require("./suspense.cjs");
+function useBaseQuery(options, Observer, queryClient) {
+  if (process.env.NODE_ENV !== "production") {
+    if (typeof options !== "object" || Array.isArray(options)) {
+      throw new Error(
+        'Bad argument type. Starting with v5, only the "Object" form is allowed when calling query related functions. Please use the error stack to find the culprit call. More info here: https://tanstack.com/query/latest/docs/react/guides/migrating-to-v5#supports-a-single-signature-one-object'
+      );
+    }
+  }
+  const isRestoring = (0, import_IsRestoringProvider.useIsRestoring)();
+  const errorResetBoundary = (0, import_QueryErrorResetBoundary.useQueryErrorResetBoundary)();
+  const client = (0, import_QueryClientProvider.useQueryClient)(queryClient);
+  const defaultedOptions = client.defaultQueryOptions(options);
+  client.getDefaultOptions().queries?._experimental_beforeQuery?.(
+    defaultedOptions
+  );
+  const query = client.getQueryCache().get(defaultedOptions.queryHash);
+  if (process.env.NODE_ENV !== "production") {
+    if (!defaultedOptions.queryFn) {
+      console.error(
+        `[${defaultedOptions.queryHash}]: No queryFn was passed as an option, and no default queryFn was found. The queryFn parameter is only optional when using a default queryFn. More info here: https://tanstack.com/query/latest/docs/framework/react/guides/default-query-function`
+      );
+    }
+  }
+  defaultedOptions._optimisticResults = isRestoring ? "isRestoring" : "optimistic";
+  (0, import_suspense.ensureSuspenseTimers)(defaultedOptions);
+  (0, import_errorBoundaryUtils.ensurePreventErrorBoundaryRetry)(defaultedOptions, errorResetBoundary, query);
+  (0, import_errorBoundaryUtils.useClearResetErrorBoundary)(errorResetBoundary);
+  const isNewCacheEntry = !client.getQueryCache().get(defaultedOptions.queryHash);
+  const [observer] = React.useState(
+    () => new Observer(
+      client,
+      defaultedOptions
+    )
+  );
+  const result = observer.getOptimisticResult(defaultedOptions);
+  const shouldSubscribe = !isRestoring && options.subscribed !== false;
+  React.useSyncExternalStore(
+    React.useCallback(
+      (onStoreChange) => {
+        const unsubscribe = shouldSubscribe ? observer.subscribe(import_query_core.notifyManager.batchCalls(onStoreChange)) : import_query_core.noop;
+        observer.updateResult();
+        return unsubscribe;
+      },
+      [observer, shouldSubscribe]
+    ),
+    () => observer.getCurrentResult(),
+    () => observer.getCurrentResult()
+  );
+  React.useEffect(() => {
+    observer.setOptions(defaultedOptions);
+  }, [defaultedOptions, observer]);
+  if ((0, import_suspense.shouldSuspend)(defaultedOptions, result)) {
+    throw (0, import_suspense.fetchOptimistic)(defaultedOptions, observer, errorResetBoundary);
+  }
+  if ((0, import_errorBoundaryUtils.getHasError)({
+    result,
+    errorResetBoundary,
+    throwOnError: defaultedOptions.throwOnError,
+    query,
+    suspense: defaultedOptions.suspense
+  })) {
+    throw result.error;
+  }
+  ;
+  client.getDefaultOptions().queries?._experimental_afterQuery?.(
+    defaultedOptions,
+    result
+  );
+  if (defaultedOptions.experimental_prefetchInRender && !import_query_core.environmentManager.isServer() && (0, import_suspense.willFetch)(result, isRestoring)) {
+    const promise = isNewCacheEntry ? (
+      // Fetch immediately on render in order to ensure `.promise` is resolved even if the component is unmounted
+      (0, import_suspense.fetchOptimistic)(defaultedOptions, observer, errorResetBoundary)
+    ) : (
+      // subscribe to the "cache promise" so that we can finalize the currentThenable once data comes in
+      query?.promise
+    );
+    promise?.catch(import_query_core.noop).finally(() => {
+      observer.updateResult();
+    });
+  }
+  return !defaultedOptions.notifyOnChangeProps ? observer.trackResult(result) : result;
+}
+// Annotate the CommonJS export names for ESM import in node:
+0 && (module.exports = {
+  useBaseQuery
+});
+//# sourceMappingURL=useBaseQuery.cjs.map