feat(tgbot): include hostname in backup and ban-log messages

Backup and ban-log pushes carried no server identity, so admins running the bot against several panels could not tell which server a backup came from. Prepend the same hostname line the periodic report and event notifications already use; the tgbot.messages.hostname key exists in all locales, so no new i18n keys are needed.

Closes #5387

internal/web/service/tgbot/tgbot_report.go

@@ -396,7 +396,8 @@ func (t *Tgbot) onlineClients(chatId int64, messageID ...int) {
 
 // sendBackup sends a backup of the database and configuration files.
 func (t *Tgbot) sendBackup(chatId int64) {
-	output := t.I18nBot("tgbot.messages.backupTime", "Time=="+time.Now().Format("2006-01-02 15:04:05"))
+	output := t.I18nBot("tgbot.messages.hostname", "Hostname=="+hostname)
+	output += t.I18nBot("tgbot.messages.backupTime", "Time=="+time.Now().Format("2006-01-02 15:04:05"))
 	t.SendMsgToTgbot(chatId, output)
 
 	// Send database backup (SQLite file, or a pg_dump archive on PostgreSQL)
@@ -442,7 +443,8 @@ func (t *Tgbot) sendBackup(chatId int64) {
 // sendBanLogs sends the ban logs to the specified chat.
 func (t *Tgbot) sendBanLogs(chatId int64, dt bool) {
 	if dt {
-		output := t.I18nBot("tgbot.messages.datetime", "DateTime=="+time.Now().Format("2006-01-02 15:04:05"))
+		output := t.I18nBot("tgbot.messages.hostname", "Hostname=="+hostname)
+		output += t.I18nBot("tgbot.messages.datetime", "DateTime=="+time.Now().Format("2006-01-02 15:04:05"))
 		t.SendMsgToTgbot(chatId, output)
 	}