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/flow/flow_user_controller.go

@@ -0,0 +1,41 @@
+package flow
+
+import (
+	flowDto "ai-agent/workflow/model/dto/flow"
+	flowService "ai-agent/workflow/service/flow"
+	"context"
+
+	"gitea.com/red-future/common/beans"
+	"github.com/gogf/gf/v2/frame/g"
+)
+
+type flowUser struct{}
+
+var FlowUser = new(flowUser)
+
+func (c *flowUser) Create(ctx context.Context, req *flowDto.CreateFlowUserReq) (res *flowDto.CreateFlowUserRes, err error) {
+	res, err = flowService.FlowUserService.Create(ctx, req)
+	return
+}
+
+func (c *flowUser) Update(ctx context.Context, req *flowDto.UpdateFlowUserReq) (res *beans.ResponseEmpty, err error) {
+	err = flowService.FlowUserService.Update(ctx, req)
+	return
+}
+
+func (c *flowUser) Delete(ctx context.Context, req *flowDto.DeleteFlowUserReq) (res *beans.ResponseEmpty, err error) {
+	err = flowService.FlowUserService.Delete(ctx, req)
+	return
+}
+
+func (c *flowUser) Get(ctx context.Context, req *flowDto.GetFlowUserReq) (res *flowDto.FlowUserVO, err error) {
+	return flowService.FlowUserService.Get(ctx, req)
+}
+
+func (c *flowUser) List(ctx context.Context, req *flowDto.ListFlowUserReq) (res *flowDto.ListFlowRes, err error) {
+	if !g.IsEmpty(req.Page) {
+		req.Page = &beans.Page{PageNum: 1, PageSize: 20}
+	}
+	res, err = flowService.FlowUserService.List(ctx, req)
+	return
+}