init: hgmj server initial commit

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

app/service/backpackser/backpack.go

@@ -0,0 +1,15 @@
+package backpackser
+
+import (
+	"91jd-server/common/stderr"
+	"91jd-server/models/v/backpackmod"
+)
+
+// 获取优惠卷列表
+func GetCouponList(uid uint64, types int, status int, limit, page int64) (interface{}, stderr.Code) {
+	list, err := backpackmod.GetCouponList(uid, types, status, limit, page)
+	if err != nil {
+		return nil, stderr.ErrDbQueryError
+	}
+	return list, stderr.Success
+}