Update demo to use published @milkie/react package

Change demo dependency from workspace reference to published version to fix Vercel builds. Add CHANGELOG link to package README.

Author: akcho

demo/package.json

@@ -9,7 +9,7 @@
     "lint": "eslint"
   },
   "dependencies": {
-    "@milkie/react": "*",
+    "@milkie/react": "^0.1.0",
     "@neondatabase/serverless": "^1.0.2",
     "@radix-ui/react-slot": "^1.2.3",
     "@radix-ui/react-tooltip": "^1.2.8",

packages/react/README.md

@@ -510,6 +510,7 @@ The components use CSS variables for theming (compatible with shadcn/ui):
 ## Documentation
 
 - **[GitHub Repository](https://github.com/akcho/milkie)** - Full source code
+- **[CHANGELOG](https://github.com/akcho/milkie/blob/main/packages/react/CHANGELOG.md)** - Version history
 - **[Live Demo](https://milkie.dev)** - Interactive examples
 - **[Backend Setup](https://github.com/akcho/milkie/blob/main/docs/BACKEND_SETUP.md)** - Database & API routes
 - **[Auth Integration](https://github.com/akcho/milkie/blob/main/docs/AUTH_INTEGRATION.md)** - Works with any auth