refactor(backend): rename OpenFlare directory to lowercase openflare

backend/openflare/plugins/server/domain/tls/errs.go

@@ -0,0 +1,21 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+// Package tls defines shared error messages for certificate management.
+package tls
+
+const (
+	errCertificateNameRequired      = "certificate name cannot be empty"
+	errCertificateNameExists        = "certificate name already exists"
+	errCertificateContentRequired   = "certificate content and key content cannot be empty"
+	errCertificateContentInvalid    = "certificate or key format is invalid"
+	errCertificateDeleteReferenced  = "certificate is still referenced by proxy routes"
+	errCertificateOnlyACME          = "only acme certificates can be updated via this endpoint"
+	errCertificateOnlyUploadConvert = "only uploaded certificates can be converted to acme"
+	errCertificateAlreadyApplying   = "certificate is already applying"
+	errCertificateOnlyACMERenew     = "only acme certificates can be renewed"
+	errCertificateFilesRequired     = "certificate file and key file cannot be empty"
+	errCertificatePEMInvalid        = "证书 PEM 内容不合法"
+
+	errDNSAccountInUse = "该 DNS 账号已被证书使用，无法删除"
+)