Apply gofmt formatting to all Go files (#588)

## Summary
- Applied `gofmt -s -w` across the entire codebase to ensure consistent
Go formatting
- This will trigger a deployment with minimal code changes

## Test plan
- [x] Pre-commit hooks pass
- [x] No functional changes, formatting only

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude <noreply@anthropic.com>

cmd/publisher/main.go

@@ -67,4 +67,4 @@ func printUsage() {
 	_, _ = fmt.Fprintln(os.Stdout, "  publish       Publish server.json to the registry")
 	_, _ = fmt.Fprintln(os.Stdout)
 	_, _ = fmt.Fprintln(os.Stdout, "Use 'mcp-publisher <command> --help' for more information about a command.")
-}
+}