Add prototype gameplay loop with character/battlefield assets and server game APIs.

Co-authored-by: Cursor <cursoragent@cursor.com>

Tools/hunyuan_3d/client.py

@@ -829,15 +829,10 @@ def generate_from_image(
             except Exception:
                 pass
             # 提交失败且页面有额度提示时，升级为换号登录
-            if "未发起生成请求" in str(exc) or "立即生成" in str(exc):
-                try:
-                    _raise_if_quota(page=page, payloads=generations_bodies)
-                except HunyuanQuotaExceeded:
-                    raise
-                # 无法确认额度时也当作需换号，方便用户打开登录页处理
-                raise HunyuanQuotaExceeded(
-                    f"{exc}（已按额度/账号问题处理：将打开登录页换号）"
-                ) from exc
+            # Only an explicit quota message should trigger account re-login.
+            # A disabled generate button can also mean that the uploaded image
+            # was rejected (for example, "?????"). Preserve that error so
+            # the caller can fix the input image without discarding a valid session.
             raise
         finally:
             browser.close()