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/vite.config.mts

@@ -0,0 +1,8 @@
+import { defineConfig } from 'vite';
+import { fileURLToPath } from 'url';
+
+const __dirname = fileURLToPath(new URL('.', import.meta.url));
+
+export default defineConfig({
+  root: __dirname,
+});