refactor: reorganize modules and add Linux build tooling

module/base/ads/internal/logic/fetch/by_pos.go

@@ -0,0 +1,40 @@
+package fetch
+
+import (
+	"context"
+
+	"bsm/full/module/base/ads/internal/impl"
+	"bsm/full/module/base/ads/internal/models"
+	pb "bsm/full/module/base/ads/pb"
+	"git.apinb.com/bsm-sdk/core/errcode"
+)
+
+// 通过广告位获取广告信息
+func ByPos(ctx context.Context, in *pb.ByPosRequest) (reply *pb.ByPosReply, err error) {
+	// 参数验证
+	if in.Key == "" {
+		return nil, errcode.ErrInvalidArgument
+	}
+
+	// 从数据库查询
+	var adsItems []models.AdsItem
+	err = impl.DBService.Where("pos_key = ? AND status = ?", in.Key, 1).Find(&adsItems).Error
+	if err != nil {
+		return nil, errcode.ErrDB
+	}
+
+	// 转换为protobuf格式
+	result := make([]*pb.AdsItem, 0, len(adsItems))
+	for _, item := range adsItems {
+		result = append(result, &pb.AdsItem{
+			Id:      int64(item.ID),
+			Title:   item.Title,
+			Content: item.Content,
+			Type:    int32(item.Type),
+			ToUrl:   item.ToUrl,
+			Created: item.CreatedAt.Format("2006-01-02 15:04:05"),
+		})
+	}
+
+	return &pb.ByPosReply{Data: result}, nil
+}