feat: 添加子流程节点与重构工作流图构建

- 新增子流程节点(SubFlow)及SubFlowConfig配置结构
- 拆分BuildGraph与BuildGraphFromFlowContent，支持独立构建图与编译
- 移除ModelCallbackReq中多余字段，移除Intent节点注册
- 优化节点执行逻辑：调整OSS上传时机及变量引用
- 更新本地开发配置及依赖版本

workflow/consts/node/node_template.go

@@ -16,15 +16,13 @@ const (
 	NodeNameAudioModel          = "生成音频"
 	NodeNameBatchModel          = "批量处理一起返回"
 	NodeNameDataConversionModel = "参数转换"
-	NodeNameSenseOptimizeModel  = "语义优化"
-	NodeNameStoryOptimizeModel  = "分镜优化"
-	NodeNameScriptOptimizeModel = "剧本优化"
 	NodeNameModel               = "模型"
 	NodeNameMerge               = "结果合并"
 	NodeNameDataMerge           = "结果汇集"
 	NodeNameJudge               = "条件判断"
 	NodeNameLoop                = "循环"
 	NodeNameForm                = "表单"
+	NodeSubFlow                 = "子流程"
 	NodeNameHttp                = "HTTP(S)接口"
 	NodeNameCustomNode          = "自定义节点"
 	NodeNameSystemSum           = "系统-结果汇总"
@@ -50,16 +48,12 @@ type NodeType string
 
 const (
 	// 组件
-	NodeTypeTextModel  NodeType = "text_model"
-	NodeTypeImageModel NodeType = "image_model"
-	NodeTypeVideoModel NodeType = "video_model"
-	NodeTypeAudioModel NodeType = "audio_model"
-	NodeTypeBatchModel NodeType = "batch_model"
-
+	NodeTypeTextModel           NodeType = "text_model"
+	NodeTypeImageModel          NodeType = "image_model"
+	NodeTypeVideoModel          NodeType = "video_model"
+	NodeTypeAudioModel          NodeType = "audio_model"
+	NodeTypeBatchModel          NodeType = "batch_model"
 	NodeTypeDataConversionModel NodeType = "data_conversion_model"
-	NodeTypeSenseOptimizeModel  NodeType = "sense_optimize_model"
-	NodeTypeStoryOptimizeModel  NodeType = "story_optimize_model"
-	NodeTypeScriptOptimizeModel NodeType = "script_optimize_model"
 	// 基础
 	NodeTypeModel     NodeType = "model"
 	NodeTypeMerge     NodeType = "merge"
@@ -67,6 +61,7 @@ const (
 	NodeTypeJudge     NodeType = "judge"
 	NodeTypeForm      NodeType = "form"
 	NodeTypeIntent    NodeType = "intent"
+	NodeTypeSubFlow   NodeType = "sub_flow"
 	NodeTypeHttp      NodeType = "http"
 	// 自定义
 	NodeTypeCustomNode NodeType = "custom_node"