* feat: enable PyPI publishing with uvx support

- Rename package to alexei-led.aws-mcp-server for PyPI availability
- Add CLI entry point for uvx/pip installation
- Refactor __main__.py to expose main() function
- Configure setuptools_scm with no-local-version for PyPI compatibility

* ci: add PyPI trusted publishing workflow

- Add publish-pypi job with OIDC authentication
- Add build-package job to verify wheel on PRs
- Use uv build and uv publish for modern tooling

* docs: add uvx installation instructions

- Add PyPI badge to README
- Document uvx as quick installation option
- Add Claude Desktop uvx configuration example

* fix: update Dockerfile to use new package name

* docs: update package name in VERSION.md