feat(federation): add remote node command support

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

go-backend/internal/http/middleware/auth.go

@@ -93,6 +93,8 @@ func shouldSkip(path string) bool {
 		return true
 	case path == "/api/v1/federation/runtime/diagnose":
 		return true
+	case path == "/api/v1/federation/runtime/command":
+		return true
 	default:
 		return false
 	}