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/loose-envify/package.json

@@ -0,0 +1,36 @@
+{
+  "name": "loose-envify",
+  "version": "1.4.0",
+  "description": "Fast (and loose) selective `process.env` replacer using js-tokens instead of an AST",
+  "keywords": [
+    "environment",
+    "variables",
+    "browserify",
+    "browserify-transform",
+    "transform",
+    "source",
+    "configuration"
+  ],
+  "homepage": "https://github.com/zertosh/loose-envify",
+  "license": "MIT",
+  "author": "Andres Suarez <zertosh@gmail.com>",
+  "main": "index.js",
+  "bin": {
+    "loose-envify": "cli.js"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/zertosh/loose-envify.git"
+  },
+  "scripts": {
+    "test": "tap test/*.js"
+  },
+  "dependencies": {
+    "js-tokens": "^3.0.0 || ^4.0.0"
+  },
+  "devDependencies": {
+    "browserify": "^13.1.1",
+    "envify": "^3.4.0",
+    "tap": "^8.0.0"
+  }
+}