Feat/游戏场景需求v1.0 (#139)

实现[游戏场景需求v1.0](https://kcnz41bksl1c.feishu.cn/wiki/JSF3wdhduinpqhkrVGKcZFp4nng?psg_id=8477599259997387860&refer_index=1&refer_type=citation)。

---------

Co-authored-by: 段舒康 <kdletters@qq.com>
Co-authored-by: suzmii <suzmii@foxmail.com>
Reviewed-on: http://192.168.35.82/git/GenarrativeAI/Genarrative/pulls/139
Co-authored-by: 董羽秦 <suzmii@qq.com>
Co-committed-by: 董羽秦 <suzmii@qq.com>

docs/openapi/genarrative-external-v1.openapi.json

@@ -3299,7 +3299,7 @@
               "ui-design",
               "publication-material"
             ],
-            "description": "省略时生成普通图片；其它值选择对应的专用生成流程。"
+            "description": "省略时生成普通图片；其它值选择对应的专用生成流程。External v1 当前不开放结构化游戏场景生成，scene 不能通过该通用图片接口提交。"
           },
           "model": {
             "type": "string",
@@ -3340,10 +3340,18 @@
             ]
           },
           "assetKind": {
-            "type": [
-              "string",
-              "null"
-            ]
+            "anyOf": [
+              {
+                "type": "string",
+                "not": {
+                  "pattern": "^\\s*scene\\s*$"
+                }
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "description": "生成产物分类。External v1 通用图片接口禁止使用 scene；结构化游戏场景必须使用主站场景专用契约。"
           },
           "generationInputs": {
             "$ref": "#/components/schemas/JsonValue"