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/tinypool/dist/esm/chunk-T6A5DJAH.js

@@ -0,0 +1,39 @@
+var __defProp = Object.defineProperty;
+var __defNormalProp = (obj, key, value) => key in obj ? __defProp(obj, key, { enumerable: true, configurable: true, writable: true, value }) : obj[key] = value;
+var __publicField = (obj, key, value) => {
+  __defNormalProp(obj, typeof key !== "symbol" ? key + "" : key, value);
+  return value;
+};
+var __accessCheck = (obj, member, msg) => {
+  if (!member.has(obj))
+    throw TypeError("Cannot " + msg);
+};
+var __privateGet = (obj, member, getter) => {
+  __accessCheck(obj, member, "read from private field");
+  return getter ? getter.call(obj) : member.get(obj);
+};
+var __privateAdd = (obj, member, value) => {
+  if (member.has(obj))
+    throw TypeError("Cannot add the same private member more than once");
+  member instanceof WeakSet ? member.add(obj) : member.set(obj, value);
+};
+var __privateSet = (obj, member, value, setter) => {
+  __accessCheck(obj, member, "write to private field");
+  setter ? setter.call(obj, value) : member.set(obj, value);
+  return value;
+};
+
+// node_modules/.pnpm/tsup@5.12.9_@swc+core@1.2.204_typescript@4.3.5/node_modules/tsup/assets/esm_shims.js
+import { fileURLToPath } from "url";
+import path from "path";
+var getFilename = () => fileURLToPath(import.meta.url);
+var getDirname = () => path.dirname(getFilename());
+var __dirname = /* @__PURE__ */ getDirname();
+
+export {
+  __publicField,
+  __privateGet,
+  __privateAdd,
+  __privateSet,
+  __dirname
+};