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/@nodelib/fs.scandir/out/constants.js

@@ -0,0 +1,17 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.IS_SUPPORT_READDIR_WITH_FILE_TYPES = void 0;
+const NODE_PROCESS_VERSION_PARTS = process.versions.node.split('.');
+if (NODE_PROCESS_VERSION_PARTS[0] === undefined || NODE_PROCESS_VERSION_PARTS[1] === undefined) {
+    throw new Error(`Unexpected behavior. The 'process.versions.node' variable has invalid value: ${process.versions.node}`);
+}
+const MAJOR_VERSION = Number.parseInt(NODE_PROCESS_VERSION_PARTS[0], 10);
+const MINOR_VERSION = Number.parseInt(NODE_PROCESS_VERSION_PARTS[1], 10);
+const SUPPORTED_MAJOR_VERSION = 10;
+const SUPPORTED_MINOR_VERSION = 10;
+const IS_MATCHED_BY_MAJOR = MAJOR_VERSION > SUPPORTED_MAJOR_VERSION;
+const IS_MATCHED_BY_MAJOR_AND_MINOR = MAJOR_VERSION === SUPPORTED_MAJOR_VERSION && MINOR_VERSION >= SUPPORTED_MINOR_VERSION;
+/**
+ * IS `true` for Node.js 10.10 and greater.
+ */
+exports.IS_SUPPORT_READDIR_WITH_FILE_TYPES = IS_MATCHED_BY_MAJOR || IS_MATCHED_BY_MAJOR_AND_MINOR;