refactor(backend): rename OpenFlare directory to lowercase openflare

backend/openflare/plugins/server/domain/site/origin/errs.go

@@ -0,0 +1,14 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+// Package origin defines shared error messages for origin management.
+package origin
+
+const (
+	errOriginAddressRequired  = "源站地址不能为空"
+	errOriginAddressInvalid   = "源站地址格式不合法"
+	errOriginAddressExists    = "源站地址已存在"
+	errOriginDeleteReferenced = "该源站仍被规则引用，无法删除"
+	errOriginMissingPort      = "源站地址缺少端口"
+	errOriginNotFound         = "源站不存在"
+)