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/api/model/conversation/common/common.go

@@ -1,3 +1,19 @@
+/*
+ * 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.
+ */
+
 // Code generated by thriftgo (0.4.1). DO NOT EDIT.
 
 package common
@@ -26,6 +42,8 @@ const (
 	Scene_GenerateAgentInfo Scene = 8
 	//openapi
 	Scene_SceneOpenApi Scene = 9
+	// workflow
+	Scene_SceneWorkflow Scene = 50
 )
 
 func (p Scene) String() string {
@@ -50,6 +68,8 @@ func (p Scene) String() string {
 		return "GenerateAgentInfo"
 	case Scene_SceneOpenApi:
 		return "SceneOpenApi"
+	case Scene_SceneWorkflow:
+		return "SceneWorkflow"
 	}
 	return "<UNSET>"
 }
@@ -76,6 +96,8 @@ func SceneFromString(s string) (Scene, error) {
 		return Scene_GenerateAgentInfo, nil
 	case "SceneOpenApi":
 		return Scene_SceneOpenApi, nil
+	case "SceneWorkflow":
+		return Scene_SceneWorkflow, nil
 	}
 	return Scene(0), fmt.Errorf("not a valid Scene string")
 }