feat: 从黄果 NET hgdjnet-server 9bfbafe 导入 HKDJ 官网后端

来源：hgdjnet-server 9bfbafe10d417deea959bd53117bc88a10e60a83
项目身份 HKDJ / JHA-216，独立官网仓库，Jenkins 守卫键 hkdjnet
测试目录 /server/hkdj_net，App/Web API 30331/30332

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

pub/common/recomapi/recomapi.go

@@ -0,0 +1,36 @@
+package recomapi
+
+import (
+	"fmt"
+	"hkdj-web-server/pub/common/log"
+	"hkdj-web-server/pub/common/srvdef"
+	"hkdj-web-server/pub/common/utils"
+	"net/http"
+	"strconv"
+)
+
+func GetRecomItems(url string, key string, userId int64, writeBack string, size int64) (
+	[]int64, *srvdef.SrvErr) {
+	reqUrl := fmt.Sprintf("%s/api/recommend/%d?n=%d&write-back=%s", url, userId, size, writeBack)
+	var resp []string
+	header := map[string]string{"X-API-Key": key}
+	code, err := utils.GetWithJResp(&resp, reqUrl, header, nil)
+	if err != nil {
+		log.Error("recomapi:GetRecomItems GetWithJResp failed",
+			log.Any("reqUrl", reqUrl), log.E(err))
+		return nil, srvdef.New(srvdef.Err, "", "")
+	}
+	if code != http.StatusOK {
+		log.Error("recomapi:GetRecomItems GetWithJResp code error.",
+			log.Any("reqUrl", reqUrl), log.Any("code", code))
+		return nil, srvdef.New(srvdef.Err, "", "")
+	}
+	itemIds := make([]int64, 0)
+	for _, v := range resp {
+		id, err := strconv.ParseInt(v, 10, 64)
+		if err == nil {
+			itemIds = append(itemIds, id)
+		}
+	}
+	return itemIds, nil
+}