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

package-lock.json

@@ -14520,6 +14520,7 @@
         "rxjs": "^7.8.2",
         "swagger-ui-express": "^5.0.1",
         "typeorm": "^0.3.28",
+        "yaml": "^2.8.3",
         "zod": "^4.3.6"
       },
       "devDependencies": {