Remove exec from openapi spec (#13)

Author: sjmiller609

cmd/api/api/instances.go

@@ -288,17 +288,6 @@ func (s *ApiService) DetachVolume(ctx context.Context, request oapi.DetachVolume
 			}, nil
 }
 
-// ExecInstance is a stub for the strict handler - actual exec uses WebSocket
-func (s *ApiService) ExecInstance(ctx context.Context, request oapi.ExecInstanceRequestObject) (oapi.ExecInstanceResponseObject, error) {
-	// This method exists to satisfy the StrictServerInterface
-	// Actual exec functionality is handled by ExecHandler which uses WebSocket upgrade
-	// This should never be called since we register the custom WebSocket route first
-	return oapi.ExecInstance500JSONResponse{
-		Code:    "internal_error",
-		Message: "use websocket exec endpoint",
-	}, nil
-}
-
 // instanceToOAPI converts domain Instance to OAPI Instance
 func instanceToOAPI(inst instances.Instance) oapi.Instance {
 	// Format sizes as human-readable strings with best precision