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/controller/skill/skill_user_controller.go

@@ -0,0 +1,30 @@
+package skill
+
+import (
+	skillDto "ai-agent/workflow/model/dto/skill"
+	skillService "ai-agent/workflow/service/skill"
+	"context"
+
+	"gitea.com/red-future/common/beans"
+)
+
+type skillUser struct{}
+
+var SkillUser = new(skillUser)
+
+func (c *skillUser) Create(ctx context.Context, req *skillDto.CreateSkillUserReq) (res *skillDto.CreateSkillUserRes, err error) {
+	return skillService.SkillUserService.Create(ctx, req)
+}
+
+func (c *skillUser) Delete(ctx context.Context, req *skillDto.DeleteSkillUserReq) (res *beans.ResponseEmpty, err error) {
+	err = skillService.SkillUserService.Delete(ctx, req)
+	return
+}
+
+func (c *skillUser) List(ctx context.Context, req *skillDto.ListSkillReq) (res *skillDto.ListSkillUserRes, err error) {
+	return skillService.SkillUserService.List(ctx, req)
+}
+
+func (c *skillUser) ListUser(ctx context.Context, req *skillDto.ListSkillUserReq) (res *skillDto.ListSkillUserRes, err error) {
+	return skillService.SkillUserService.ListUser(ctx, req)
+}