feat: migrate examples from prototype and add CSS modules support

- Migrate HTML and React demo applications from prototype to examples/ directory
- Add examples to workspace configuration with selective build support
- Update workspace scripts for library-only builds (build:libs) and example dev servers
- Fix React MediaProvider context conflicts by consolidating exports
- Add esbuild-css-modules-plugin for CSS modules support in React package
- Configure tsup for flattened output structure with CSS processing
- Update package exports and imports for new @vjs-10/* scoped packages

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

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

examples/html-demo/src/main.ts

@@ -0,0 +1,11 @@
+import { defineVjsPlayer } from '@vjs-10/html';
+
+defineVjsPlayer();
+
+document.body.innerHTML = `
+  <media-provider>
+    <media-skin-default>
+      <video slot="media" src="https://www.w3schools.com/html/mov_bbb.mp4" muted></video>
+    </media-skin-default>
+  </media-provider>
+`;