[test] 删除旧版备份

projects/test/legacy/project.json

@@ -1,23 +1 @@
-{
-  "id": "test",
-  "slug": "test",
-  "name": "测试",
-  "purpose": "",
-  "artDirection": "",
-  "outputSpec": {
-    "size": "1024x1024",
-    "format": "png",
-    "naming": "{slug}_{asset}_v{n}"
-  },
-  "glossary": [],
-  "worldSetting": "",
-  "styleBible": {
-    "keywords": [],
-    "palette": [],
-    "brushLine": "",
-    "proportion": "",
-    "bannedElements": []
-  },
-  "styleVersion": 0,
-  "presets": []
-}
+{"artrig":"legacy-backup-deleted"}