feat(webhook): persist incoming provider messages

internal/handler/webhook/telegram_webhook.go

@@ -36,6 +36,7 @@ type TelegramWebhookHandler struct {
 	provider   *channelprovider.TelegramProvider
 	telWebhook *telegramchannel.WebhookHandler
 	db         *gorm.DB
+	persister  *IncomingPersister
 }
 
 // NewTelegramWebhookHandler creates a Telegram webhook handler for Gin integration.
@@ -48,6 +49,7 @@ func NewTelegramWebhookHandler(
 		provider:   provider,
 		telWebhook: telWebhook,
 		db:         db,
+		persister:  NewIncomingPersister(db),
 	}
 }
 
@@ -115,9 +117,12 @@ func (h *TelegramWebhookHandler) HandleTelegramWebhook(c *gin.Context) {
 	if err != nil {
 		applogger.L().Errorf("Telegram webhook: message processing failed (update_id=%d): %v", update.UpdateID, err)
 	} else if incomingMsg != nil {
-		applogger.L().Infof("Telegram webhook: message processed (inbox_id=%d, source_id=%s)",
-			incomingMsg.InboxID, incomingMsg.SourceID)
-		// TODO: Push to message broker/dispatcher for persistence + notification
+		if _, persistErr := h.persister.PersistIncoming(c.Request.Context(), inbox, incomingMsg); persistErr != nil {
+			applogger.L().Errorf("Telegram webhook: persist message failed (update_id=%d source_id=%s): %v", update.UpdateID, incomingMsg.SourceID, persistErr)
+		} else {
+			applogger.L().Infof("Telegram webhook: message persisted (inbox_id=%d, source_id=%s)",
+				incomingMsg.InboxID, incomingMsg.SourceID)
+		}
 	}
 
 	// Always return 200 OK to Telegram — it retries if not 200