feat: 新增会话与结果管理功能及扩展字段

重构执行列表树状结构，扁平化日期节点下的输出项，新增会话列表查询、结果删除与软删除标记，引入扩展字段与模板配置，升级依赖版本。

workflow/model/entity/flow_execution.go

@@ -23,6 +23,9 @@ type FlowExecution struct {
 	SessionId       string                        `orm:"session_id" json:"sessionId" description:"会话ID"`
 	TotalTokens     int                           `orm:"total_tokens" json:"totalTokens" description:"总token消耗"`
 	TotalFee        int                           `orm:"total_fee" json:"totalFee" description:"总费用"`
+	SessionDel      bool                          `orm:"session_del" json:"sessionDel" description:"会话是否删除"`
+	ResultDel       bool                          `orm:"result_del" json:"resultDel" description:"结果是否删除"`
+	Extension       map[string]interface{}        `orm:"extension" json:"extension" description:"扩展字段"`
 }
 
 type flowExecutionCol struct {
@@ -41,6 +44,9 @@ type flowExecutionCol struct {
 	SessionId       string
 	TotalTokens     string
 	TotalFee        string
+	SessionDel      string
+	ResultDel       string
+	Extension       string
 }
 
 var FlowExecutionCol = flowExecutionCol{
@@ -59,4 +65,7 @@ var FlowExecutionCol = flowExecutionCol{
 	SessionId:       "session_id",
 	TotalTokens:     "total_tokens",
 	TotalFee:        "total_fee",
+	SessionDel:      "session_del",
+	ResultDel:       "result_del",
+	Extension:       "extension",
 }