chore: 并入 iotlcm-app 历史到 app/（原提交 f40bda9）

app/server/internal/consts/http.go

@@ -0,0 +1,14 @@
+// Package consts
+// @Link  https://github.com/xiujiecn/xiu-admin
+// @Copyright  Copyright (c) 2025 LiXiujie
+// @Author  Lxj <li@example.com>
+// @License  https://github.com/xiujiecn/xiu-admin/blob/master/LICENSE
+package consts
+
+const (
+	HTTPContentTypeXml    = "text/xml"
+	HTTPContentTypeHtml   = "text/html"
+	HTTPContentTypeStream = "text/event-stream"
+	HTTPContentTypeJson   = "application/json"
+	HTTPContentTypeExcel  = "application/octet-stream"
+)