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/tsconfig.json

@@ -0,0 +1,12 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "baseUrl": ".",
+    "paths": {
+      "@vjs/html": ["../../packages/html/src"],
+      "@vjs/react": ["../../packages/react/src"],
+      "@vjs/core": ["../../packages/core/src"]
+    }
+  },
+  "include": ["src"]
+}