Refactor Docker setup and frontend structure

- Updated Dockerfile to copy frontend files to meshchatx/public directory.
- Modified .dockerignore to include meshchatx/public.
- Added a new script to prepare the frontend directory.
- Adjusted Vite configuration to output to the new public directory.
- Updated GitHub Actions workflow to reflect changes in build process and artifact handling.

.dockerignore

@@ -15,6 +15,7 @@ Makefile
 build/
 dist/
 public/
+meshchatx/public/
 node_modules/
 __pycache__/
 *.py[cod]