Implement support for bundling web assets into CLI single executable binaries.
When built with --with-web-assets, the executable includes the compiled web
application and serves it directly without file system access. A stub generator
creates empty manifests for normal builds to maintain compatibility.
Key changes:
- Add --with-web-assets flag to build-executable.ts with manifest validation
- Generate embeddedAssets.ts manifest from web/dist during build
- Serve embedded assets in web server with fallback to file system
- Add hapi server subcommand to start API + web server
- Include server sources in CLI tsconfig for compilation scope
- Add workspace-level build:single-exe scripts for production builds
