feat(ai): 自由创作视频生成全量移植(/free-create)——Seedance 文/图生视频+按时长计费+人物素材库

后端:
- free_video.py: 提交/轮询/收藏/软删全链路,复用 AITask(新增 is_deleted/is_favorited, migration 0022)
- video_pricing.py: 按时长 token 计费(×1.10 buffer+clamp); video_errors.py 错误归一; media_probe.py 时长探测
- catalog/volcano: Seedance free-video 模型接入+seed(migration 0023)
- 素材库: FreeAssetGroup/FreeAsset(火山 Assets API 引用登记, migration 0009)+ 上传/轮询/删除接口
- settings: FREE_VIDEO_MAX_CONCURRENT 团队并发闸(默认3); CELERY_TASK_ALWAYS_EAGER 本地联调开关(生产恒关)
- 测试: test_free_video.py 新增; billing/products/projects tests 配套调整

前端:
- /free-create 页面+components/free-create/ 全套(输入栏/@mention 素材引用/生成卡/视频详情弹窗/素材库弹窗)
- api.ts/types.ts 扩展 free-video 与 free-assets 接口; 路由/侧边栏入口接入

bug/: 测试清单 (11)(12) 与截图归档

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

core/backend/apps/assets/assets_client.py

@@ -59,7 +59,11 @@ def _get_service():
         Credentials(ak, sk, SERVICE, REGION),
         10, 30,
     )
-    actions = ["CreateAssetGroup", "CreateAsset", "ListAssetGroups", "ListAssets", "GetAsset", "DeleteAsset"]
+    actions = [
+        "CreateAssetGroup", "CreateAsset", "ListAssetGroups", "ListAssets", "GetAsset", "DeleteAsset",
+        # 自由创作素材库(组/素材全生命周期)
+        "GetAssetGroup", "UpdateAssetGroup", "UpdateAsset", "DeleteAssetGroup",
+    ]
     api_info = {a: ApiInfo("POST", "/", {"Action": a, "Version": API_VERSION}, {}, {}) for a in actions}
     return Service(service_info, api_info)
 
@@ -117,3 +121,49 @@ def list_asset_groups(page: int = 1, page_size: int = 20, name: str | None = Non
         {"Filter": filter_dict, "PageNumber": page, "PageSize": page_size, "ProjectName": _project()},
     )
     return result.get("Items", []), result.get("TotalCount", 0)
+
+
+def list_assets(group_ids: list | None = None, status: str | None = None,
+                name: str | None = None, page: int = 1, page_size: int = 20) -> tuple:
+    """列组内素材。返回 (items, total_count)。"""
+    filter_dict: dict = {"GroupType": "AIGC"}
+    if group_ids:
+        filter_dict["GroupIds"] = group_ids
+    if status:
+        filter_dict["Statuses"] = [status]
+    if name:
+        filter_dict["Name"] = name
+    result = _do_request(
+        "ListAssets",
+        {"Filter": filter_dict, "PageNumber": page, "PageSize": page_size, "ProjectName": _project()},
+    )
+    return result.get("Items", []), result.get("TotalCount", 0)
+
+
+def get_asset_group(group_id: str) -> dict:
+    return _do_request("GetAssetGroup", {"Id": group_id, "ProjectName": _project()})
+
+
+def update_asset_group(group_id: str, name: str | None = None, description: str | None = None) -> None:
+    body: dict = {"Id": group_id, "ProjectName": _project()}
+    if name is not None:
+        body["Name"] = name
+    if description is not None:
+        body["Description"] = description
+    _do_request("UpdateAssetGroup", body)
+
+
+def update_asset(asset_id: str, name: str | None = None) -> None:
+    body: dict = {"Id": asset_id, "ProjectName": _project()}
+    if name is not None:
+        body["Name"] = name
+    _do_request("UpdateAsset", body)
+
+
+def delete_asset(asset_id: str) -> None:
+    _do_request("DeleteAsset", {"Id": asset_id, "ProjectName": _project()})
+
+
+def delete_asset_group(group_id: str) -> None:
+    """删组(远程级联删组内素材)。"""
+    _do_request("DeleteAssetGroup", {"Id": group_id, "ProjectName": _project()})