feat(react): enable automatic CSS injection for MediaSkinDefault component

- Configure rollup to inject CSS directly into JavaScript bundles instead of extracting to separate files
- Remove CSS export from package.json as styles are now auto-included
- Update react-demo to remove manual CSS import requirement
- Enable seamless component usage: import { MediaSkinDefault } from '@vjs-10/react' now automatically includes styles

This provides the expected developer experience for React component libraries where
importing a component automatically brings its required styles without manual CSS imports.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

examples/react-demo/src/main.tsx

@@ -1,7 +1,6 @@
 import React from 'react';
 import ReactDOM from 'react-dom/client';
 import { MediaProvider, Video, MediaSkinDefault } from '@vjs-10/react';
-import '@vjs-10/react/style.css';
 
 const DemoPlayer = () => {
   return (

packages/react/react/package.json

@@ -10,8 +10,7 @@
       "types": "./dist/index.d.ts",
       "import": "./dist/index.mjs",
       "require": "./dist/index.js"
-    },
-    "./style.css": "./dist/index.css"
+    }
   },
   "files": [
     "dist"

packages/react/react/rollup.config.js

@@ -26,10 +26,10 @@ module.exports = [
       commonjs(),
       postcss({
         modules: true,
-        extract: 'index.css',
+        extract: false, // Don't extract CSS to separate file
+        inject: true,   // Inject CSS into JS bundle
         minimize: false,
         sourceMap: true,
-        inject: false, // Don't inject CSS, extract it
       }),
       typescript({
         tsconfig: 'tsconfig.json',
@@ -60,8 +60,10 @@ module.exports = [
       commonjs(),
       postcss({
         modules: true,
-        extract: false, // Don't extract CSS for CJS build to avoid conflicts
+        extract: false, // Don't extract CSS for CJS build
+        inject: true,   // Inject CSS into JS bundle
         minimize: false,
+        sourceMap: true,
       }),
       typescript({
         tsconfig: 'tsconfig.json',