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/tailwindcss/lib/cli-peer-dependencies.js

@@ -0,0 +1,36 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", {
+    value: true
+});
+function _export(target, all) {
+    for(var name in all)Object.defineProperty(target, name, {
+        enumerable: true,
+        get: all[name]
+    });
+}
+_export(exports, {
+    lazyPostcss: function() {
+        return lazyPostcss;
+    },
+    lazyPostcssImport: function() {
+        return lazyPostcssImport;
+    },
+    lazyAutoprefixer: function() {
+        return lazyAutoprefixer;
+    },
+    lazyCssnano: function() {
+        return lazyCssnano;
+    }
+});
+function lazyPostcss() {
+    return require("postcss");
+}
+function lazyPostcssImport() {
+    return require("postcss-import");
+}
+function lazyAutoprefixer() {
+    return require("autoprefixer");
+}
+function lazyCssnano() {
+    return require("cssnano");
+}