fix(tgbot): suppress 'message not modified' warnings in Telegram edit calls (#6340)

When users click Refresh buttons in the Telegram bot (usage_refresh,
client_refresh, ips_refresh, onlines_refresh), editMessageText and
editMessageReplyMarkup are always called even when the content has not
changed. Telegram returns a 400 "message is not modified" error which
was logged as Warning, cluttering the logs on every refresh click.

Add isTelegramNotModifiedError helper that detects this specific
Telegram API error and logs it at Debug level instead of Warning.

internal/web/service/tgbot/tgbot_send.go

@@ -210,6 +210,10 @@ func (t *Tgbot) editMessageCallbackTgBot(chatId int64, messageID int, inlineKeyb
 		ReplyMarkup: inlineKeyboard,
 	}
 	if _, err := bot.EditMessageReplyMarkup(context.Background(), &params); err != nil {
+		if isTelegramNotModifiedError(err) {
+			logger.Debug("Telegram reply markup unchanged, skipping edit")
+			return
+		}
 		logger.Warning(err)
 	}
 }
@@ -226,10 +230,25 @@ func (t *Tgbot) editMessageTgBot(chatId int64, messageID int, text string, inlin
 		params.ReplyMarkup = inlineKeyboard[0]
 	}
 	if _, err := bot.EditMessageText(context.Background(), &params); err != nil {
+		if isTelegramNotModifiedError(err) {
+			logger.Debug("Telegram message text unchanged, skipping edit")
+			return
+		}
 		logger.Warning(err)
 	}
 }
 
+// Telegram answers a no-op edit with a 400 whose description carries this text;
+// a refresh tap that changed nothing is not an operator-visible failure.
+func isTelegramNotModifiedError(err error) bool {
+	if err == nil {
+		return false
+	}
+	errStr := err.Error()
+	return strings.Contains(errStr, "not modified") ||
+		strings.Contains(errStr, "No fields to modify")
+}
+
 // SendMsgToTgbotDeleteAfter sends a message and deletes it after a specified delay.
 func (t *Tgbot) SendMsgToTgbotDeleteAfter(chatId int64, msg string, delayInSeconds int, replyMarkup ...telego.ReplyMarkup) {
 	// Determine if replyMarkup was passed; otherwise, set it to nil