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/vitest/dist/vendor/global.CkGT_TMy.js

@@ -0,0 +1,23 @@
+function getWorkerState() {
+  const workerState = globalThis.__vitest_worker__;
+  if (!workerState) {
+    const errorMsg = 'Vitest failed to access its internal state.\n\nOne of the following is possible:\n- "vitest" is imported directly without running "vitest" command\n- "vitest" is imported inside "globalSetup" (to fix this, use "setupFiles" instead, because "globalSetup" runs in a different context)\n- Otherwise, it might be a Vitest bug. Please report it to https://github.com/vitest-dev/vitest/issues\n';
+    throw new Error(errorMsg);
+  }
+  return workerState;
+}
+function provideWorkerState(context, state) {
+  Object.defineProperty(context, "__vitest_worker__", {
+    value: state,
+    configurable: true,
+    writable: true,
+    enumerable: false
+  });
+  return state;
+}
+function getCurrentEnvironment() {
+  const state = getWorkerState();
+  return state == null ? void 0 : state.environment.name;
+}
+
+export { getCurrentEnvironment as a, getWorkerState as g, provideWorkerState as p };