refactor(workspace): restore yaml exports and align docker builds

- return scenario export payloads as yaml to match existing workflows

- harden step reordering flow for drag-and-drop and one-based ui labels

- switch server container to workspace-lockfile installs and root ignore rules

docker-compose.yaml

@@ -1,8 +1,8 @@
 services:
   server:
     build:
-      context: ./server
-      dockerfile: Dockerfile
+      context: .
+      dockerfile: server/Dockerfile
     ports:
       - "13000:3000"
     env_file: