feat: Support for Chat Flow & Agent Support for binding a single chat flow (#765)

Co-authored-by: Yu Yang <72337138+tomasyu985@users.noreply.github.com>
Co-authored-by: zengxiaohui <csu.zengxiaohui@gmail.com>
Co-authored-by: lijunwen.gigoo <lijunwen.gigoo@bytedance.com>
Co-authored-by: lvxinyu.1117 <lvxinyu.1117@bytedance.com>
Co-authored-by: liuyunchao.0510 <liuyunchao.0510@bytedance.com>
Co-authored-by: haozhenfei <37089575+haozhenfei@users.noreply.github.com>
Co-authored-by: July <jiangxujin@bytedance.com>
Co-authored-by: tecvan-fe <fanwenjie.fe@bytedance.com>

backend/crossdomain/impl/upload/upload.go

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2025 coze-dev Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package upload
+
+import (
+	"context"
+
+	crossupload "github.com/coze-dev/coze-studio/backend/crossdomain/contract/upload"
+	"github.com/coze-dev/coze-studio/backend/domain/upload/service"
+)
+
+var defaultSVC crossupload.Uploader
+
+type impl struct {
+	DomainSVC service.UploadService
+}
+
+func InitDomainService(c service.UploadService) crossupload.Uploader {
+	defaultSVC = &impl{
+		DomainSVC: c,
+	}
+
+	return defaultSVC
+}
+
+func (c *impl) GetFile(ctx context.Context, req *service.GetFileRequest) (resp *service.GetFileResponse, err error) {
+	return c.DomainSVC.GetFile(ctx, req)
+}