## Summary
- Replace default `flag.Usage` with custom 2-column layout using `text/tabwriter`
- Add short and long aliases for all CLI flags
- Add environment variables section with sorted entries
- Handle `-version` flag in `Execute()`
## Sample output
```
Usage: gitea-mcp [options]
Options:
-t, -transport <type> Transport type: stdio or http (default: stdio)
-H, -host <url> Gitea host URL (default: https://gitea.com)
-p, -port <number> HTTP server port (default: 8080)
-T, -token <token> Personal access token
-r, -read-only Expose only read-only tools
-d, -debug Enable debug mode
-k, -insecure Ignore TLS certificate errors
-v, -version Print version and exit
Environment variables:
GITEA_ACCESS_TOKEN Provide access token
GITEA_DEBUG Set to 'true' for debug mode
GITEA_HOST Override Gitea host URL
GITEA_INSECURE Set to 'true' to ignore TLS errors
GITEA_READONLY Set to 'true' for read-only mode
MCP_MODE Override transport mode
```
*Created by Claude on behalf of @silverwind*
Reviewed-on: https://gitea.com/gitea/gitea-mcp/pulls/139
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: silverwind <me@silverwind.io>
Co-committed-by: silverwind <me@silverwind.io>
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