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/path-key/package.json

@@ -0,0 +1,39 @@
+{
+	"name": "path-key",
+	"version": "3.1.1",
+	"description": "Get the PATH environment variable key cross-platform",
+	"license": "MIT",
+	"repository": "sindresorhus/path-key",
+	"author": {
+		"name": "Sindre Sorhus",
+		"email": "sindresorhus@gmail.com",
+		"url": "sindresorhus.com"
+	},
+	"engines": {
+		"node": ">=8"
+	},
+	"scripts": {
+		"test": "xo && ava && tsd"
+	},
+	"files": [
+		"index.js",
+		"index.d.ts"
+	],
+	"keywords": [
+		"path",
+		"key",
+		"environment",
+		"env",
+		"variable",
+		"var",
+		"get",
+		"cross-platform",
+		"windows"
+	],
+	"devDependencies": {
+		"@types/node": "^11.13.0",
+		"ava": "^1.4.1",
+		"tsd": "^0.7.2",
+		"xo": "^0.24.0"
+	}
+}