fix broken startup on disabled servers

pkg/app/run.go

@@ -44,13 +44,11 @@ func (a *App) MustRun() {
 	// Prepare GRPC first. The GRPC server may update its opts
 	// with a prepared GRPC-Gateway runtime.ServeMux if any of its services
 	// have added GRPC-Gateway handlers. If present, serve under api path
-	if a.cfg.GRPCEnabled() {
-		a.runGRPC(ctx)
-	}
+	a.runGRPC(ctx)
 
-	if a.cfg.HTTPEnabled() {
-		a.runHTTP(ctx)
-	}
+	// Second, prepare and run HTTP server, embedding grpc-gateway
+	// runtime.ServeMux if set by runGRPC()
+	a.runHTTP(ctx)
 
 	// Monitor app lifecycle
 	go a.monitor()