Feat: TLS certificate menu and config dialog for the MFC server

Add a "TLS证书" item to the Extensions menu below "MCP设置" that opens a
runtime-built dialog to enable one-way TLS and set the certificate and
private-key paths. On OK it writes the [tls] Enabled/CertPath/KeyPath keys
and calls ServerTlsIdentity::Load() so the change takes effect for new
connections immediately (design doc §7.1), mirroring the existing
CMcpSettingsDlg runtime-template pattern. All new strings are wired into
the en_US / zh_TW / de_DE language files, and the menu item is gated by
HIDE_MENU_TLS_CERTIFICATE / MF_TLS_CERTIFICATE like MCP settings.

Co-Authored-By: deepseek-v4-pro

server/2015Remote/lang/zh_TW.ini

@@ -2075,3 +2075,15 @@ JPEG
 连接数:%d=連線數:%d
 强制断开=強制中斷
 远程交谈=遠程交談
+
+; ===== TLS =====
+TLS证书(&T)...=TLS 憑證(&T)...
+TLS证书=TLS 憑證
+启用加密=啟用加密
+证书路径=憑證路徑
+私钥路径=私鑰路徑
+请填写证书路径=請填寫憑證路徑
+请填写私钥路径=請填寫私鑰路徑
+TLS 配置已保存。=TLS 設定已儲存。
+改动对新建连接即时生效。=變更對新連線即時生效。
+证书/私钥加载失败，加密功能未生效。请检查文件路径与格式（证书 PEM、私钥 PKCS#8）。=憑證/私鑰載入失敗，加密功能未生效。請檢查檔案路徑與格式（憑證 PEM、私鑰 PKCS#8）。