feat: 新增工作流执行模块

新增流程执行记录的实体、DTO、DAO、控制器和服务层，支持工作流的执行、回调及结果树状列表查询；同时更新服务名称为 ai-agent。

workflow/model/entity/flow_execution.go

@@ -0,0 +1,53 @@
+package entity
+
+import (
+	"ai-agent/workflow/consts/flow"
+
+	"gitea.com/red-future/common/beans"
+)
+
+type FlowExecution struct {
+	beans.SQLBaseDO `orm:",inherit"` // 嵌入基础字段：Id, TenantId, Creator, CreatedAt, Updater, UpdatedAt, DeletedAt
+	// 业务字段
+	FlowUserId      int64                         `orm:"flow_user_id" json:"flowUserId" description:"流程ID"`
+	FlowName        string                        `orm:"flow_name" json:"flowName" description:"流程名称"`
+	TriggerType     flow.FlowExecutionTriggerType `orm:"trigger_type" json:"triggerType" description:"触发类型"`
+	DurationMs      int64                         `orm:"duration_ms" json:"durationMs" description:"执行时长（毫秒）"`
+	Status          flow.FlowExecutionStatus      `orm:"status" json:"status" description:"状态:1-运行中,2-成功,3-失败"`
+	FlowContent     *FlowInfo                     `orm:"flow_content" json:"flowContent" description:"流程内容"`
+	NodeInputParams []*FlowNode                   `orm:"node_input_params" json:"nodeInputParams" description:"节点输入参数"`
+	OutputParams    []map[string]interface{}      `orm:"output_params" json:"outputParams" description:"输出参数"`
+	ErrorMessage    string                        `orm:"error_message" json:"errorMessage" description:"错误信息"`
+	TraceId         string                        `orm:"trace_id" json:"traceId" description:"跟踪ID"`
+	SessionId       string                        `orm:"session_id" json:"sessionId" description:"会话ID"`
+}
+
+type flowExecutionCol struct {
+	beans.SQLBaseCol
+	FlowUserId      string
+	FlowName        string
+	TriggerType     string
+	DurationMs      string
+	Status          string
+	FlowContent     string
+	NodeInputParams string
+	OutputParams    string
+	ErrorMessage    string
+	TraceId         string
+	SessionId       string
+}
+
+var FlowExecutionCol = flowExecutionCol{
+	SQLBaseCol:      beans.DefSQLBaseCol,
+	FlowUserId:      "flow_user_id",
+	FlowName:        "flow_name",
+	TriggerType:     "trigger_type",
+	DurationMs:      "duration_ms",
+	Status:          "status",
+	FlowContent:     "flow_content",
+	NodeInputParams: "node_input_params",
+	OutputParams:    "output_params",
+	ErrorMessage:    "error_message",
+	TraceId:         "trace_id",
+	SessionId:       "session_id",
+}