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/autoprefixer/lib/hacks/image-rendering.js

@@ -0,0 +1,48 @@
+let Declaration = require('../declaration')
+
+class ImageRendering extends Declaration {
+  /**
+   * Add hack only for crisp-edges
+   */
+  check(decl) {
+    return decl.value === 'pixelated'
+  }
+
+  /**
+   * Return property name by spec
+   */
+  normalize() {
+    return 'image-rendering'
+  }
+
+  /**
+   * Change property name for IE
+   */
+  prefixed(prop, prefix) {
+    if (prefix === '-ms-') {
+      return '-ms-interpolation-mode'
+    }
+    return super.prefixed(prop, prefix)
+  }
+
+  /**
+   * Warn on old value
+   */
+  process(node, result) {
+    return super.process(node, result)
+  }
+
+  /**
+   * Change property and value for IE
+   */
+  set(decl, prefix) {
+    if (prefix !== '-ms-') return super.set(decl, prefix)
+    decl.prop = '-ms-interpolation-mode'
+    decl.value = 'nearest-neighbor'
+    return decl
+  }
+}
+
+ImageRendering.names = ['image-rendering', 'interpolation-mode']
+
+module.exports = ImageRendering