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.stat/package.json

@@ -0,0 +1,37 @@
+{
+  "name": "@nodelib/fs.stat",
+  "version": "2.0.5",
+  "description": "Get the status of a file with some features",
+  "license": "MIT",
+  "repository": "https://github.com/nodelib/nodelib/tree/master/packages/fs/fs.stat",
+  "keywords": [
+    "NodeLib",
+    "fs",
+    "FileSystem",
+    "file system",
+    "stat"
+  ],
+  "engines": {
+    "node": ">= 8"
+  },
+  "files": [
+    "out/**",
+    "!out/**/*.map",
+    "!out/**/*.spec.*"
+  ],
+  "main": "out/index.js",
+  "typings": "out/index.d.ts",
+  "scripts": {
+    "clean": "rimraf {tsconfig.tsbuildinfo,out}",
+    "lint": "eslint \"src/**/*.ts\" --cache",
+    "compile": "tsc -b .",
+    "compile:watch": "tsc -p . --watch --sourceMap",
+    "test": "mocha \"out/**/*.spec.js\" -s 0",
+    "build": "npm run clean && npm run compile && npm run lint && npm test",
+    "watch": "npm run clean && npm run compile:watch"
+  },
+  "devDependencies": {
+    "@nodelib/fs.macchiato": "1.0.4"
+  },
+  "gitHead": "d6a7960d5281d3dd5f8e2efba49bb552d090f562"
+}