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

server/package.json

@@ -1,6 +1,5 @@
 {
   "name": "liqa-server",
-  "version": "1.0.0",
   "main": "index.js",
   "scripts": {
     "build": "nest build",
@@ -37,6 +36,7 @@
     "rxjs": "^7.8.2",
     "swagger-ui-express": "^5.0.1",
     "typeorm": "^0.3.28",
+    "yaml": "^2.8.3",
     "zod": "^4.3.6"
   },
   "devDependencies": {