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/service/flow/flow_template_service.go

@@ -0,0 +1,55 @@
+package flow
+
+import (
+	flowDao "ai-agent/workflow/dao/flow"
+	flowDto "ai-agent/workflow/model/dto/flow"
+	"context"
+
+	"github.com/gogf/gf/v2/util/gconv"
+)
+
+var FlowTemplateService = &flowTemplateService{}
+
+type flowTemplateService struct{}
+
+func (s *flowTemplateService) Create(ctx context.Context, req *flowDto.CreateFlowTemplateReq) (res *flowDto.CreateFlowTemplateRes, err error) {
+	req.NodeInputParams = ExtractFlowNodeFrom(req.FlowContent)
+	id, err := flowDao.FlowTemplateDao.Insert(ctx, req)
+	if err != nil {
+		return
+	}
+	return &flowDto.CreateFlowTemplateRes{Id: id}, nil
+}
+
+func (s *flowTemplateService) Update(ctx context.Context, req *flowDto.UpdateFlowTemplateReq) (err error) {
+	req.NodeInputParams = ExtractFlowNodeFrom(req.FlowContent)
+	_, err = flowDao.FlowTemplateDao.Update(ctx, req)
+	return
+}
+
+func (s *flowTemplateService) Delete(ctx context.Context, req *flowDto.DeleteFlowTemplateReq) (err error) {
+	_, err = flowDao.FlowTemplateDao.Delete(ctx, req)
+	return
+}
+
+func (s *flowTemplateService) Get(ctx context.Context, req *flowDto.GetFlowTemplateReq) (res *flowDto.FlowTemplateVO, err error) {
+	flowInfo, err := flowDao.FlowTemplateDao.Get(ctx, req)
+	if err != nil {
+		return
+	}
+	res = new(flowDto.FlowTemplateVO)
+	err = gconv.Struct(flowInfo, res)
+	return
+}
+
+func (s *flowTemplateService) List(ctx context.Context, req *flowDto.ListFlowTemplateReq) (res *flowDto.ListFlowTemplateRes, err error) {
+	list, total, err := flowDao.FlowTemplateDao.List(ctx, req)
+	if err != nil {
+		return
+	}
+	res = &flowDto.ListFlowTemplateRes{
+		Total: total,
+	}
+	err = gconv.Struct(list, &res.List)
+	return
+}