refactor(backend): rename OpenFlare directory to lowercase openflare

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

@@ -0,0 +1,10 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+// Package apply_log manages the application of configuration change logs,
+// including validation and retention policy enforcement.
+package apply_log
+
+const (
+	errRetentionDaysOutOfRange = "retention_days 必须在 1 到 3650 之间"
+)