test(ui-migration): 单界面 MCP 落地验证并回填 spec

Login_Layer 18 个节点经中间描述落地为 prefab, 结构比对通过。
实测耗时回填 spec §5, 作为「是否需要写编辑器扩展」的判断依据。

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

cocoscreator_projects/YouleNexus/assets/framework/ui/prefabs.meta

@@ -0,0 +1,9 @@
+{
+  "ver": "1.2.0",
+  "importer": "directory",
+  "imported": true,
+  "uuid": "476d4a98-9db1-426a-a797-0849baf09252",
+  "files": [],
+  "subMetas": {},
+  "userData": {}
+}

cocoscreator_projects/YouleNexus/assets/framework/ui/prefabs/Login_Layer.prefab.meta

@@ -0,0 +1,14 @@
+{
+  "ver": "1.1.50",
+  "importer": "prefab",
+  "imported": true,
+  "uuid": "b209cefb-b381-4c7c-b765-94a5ab75a89c",
+  "files": [
+    ".json"
+  ],
+  "subMetas": {},
+  "userData": {
+    "syncNodeName": "Login_Layer",
+    "hasIcon": false
+  }
+}