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/browserslist/package.json

@@ -0,0 +1,45 @@
+{
+  "name": "browserslist",
+  "version": "4.28.2",
+  "description": "Share target browsers between different front-end tools, like Autoprefixer, Stylelint and babel-env-preset",
+  "keywords": [
+    "browsers",
+    "caniuse",
+    "target"
+  ],
+  "license": "MIT",
+  "author": "Andrey Sitnik <andrey@sitnik.es>",
+  "repository": "browserslist/browserslist",
+  "funding": [
+    {
+      "type": "opencollective",
+      "url": "https://opencollective.com/browserslist"
+    },
+    {
+      "type": "tidelift",
+      "url": "https://tidelift.com/funding/github/npm/browserslist"
+    },
+    {
+      "type": "github",
+      "url": "https://github.com/sponsors/ai"
+    }
+  ],
+  "bin": {
+    "browserslist": "cli.js"
+  },
+  "browser": {
+    "./node.js": "./browser.js",
+    "path": false
+  },
+  "types": "./index.d.ts",
+  "dependencies": {
+    "baseline-browser-mapping": "^2.10.12",
+    "caniuse-lite": "^1.0.30001782",
+    "electron-to-chromium": "^1.5.328",
+    "node-releases": "^2.0.36",
+    "update-browserslist-db": "^1.2.3"
+  },
+  "engines": {
+    "node": "^6 || ^7 || ^8 || ^9 || ^10 || ^11 || ^12 || >=13.7"
+  }
+}