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/skill_user.go

@@ -0,0 +1,31 @@
+package entity
+
+import "gitea.com/red-future/common/beans"
+
+type SkillUser struct {
+	beans.SQLBaseDO `orm:",inherit"` // 嵌入基础字段：Id, TenantId, Creator, CreatedAt, Updater, UpdatedAt, DeletedAt
+
+	Name        string `orm:"name" json:"name"`
+	Description string `orm:"description" json:"description"`
+	Category    string `orm:"category" json:"category"`
+	FileName    string `orm:"file_name" json:"fileName"`
+	FileUrl     string `orm:"file_url" json:"fileUrl"`
+}
+
+type skillUserCol struct {
+	beans.SQLBaseCol
+	Name        string
+	Description string
+	Category    string
+	FileName    string
+	FileUrl     string
+}
+
+var SkillUserCol = skillUserCol{
+	SQLBaseCol:  beans.DefSQLBaseCol,
+	Name:        "name",
+	Description: "description",
+	Category:    "category",
+	FileName:    "file_name",
+	FileUrl:     "file_url",
+}