feat: aso add label for ai processed

cmd/paraclub-ai-mailer/main.go

@@ -136,6 +136,18 @@ func processEmails(imapClient *imap.IMAPClient, fetcher *fetcher.Fetcher, aiProc
 		}
 		logger.WithField("responseLength", len(response)).Debug("Generated AI response")
 
+		// Mark as AI-processed immediately to prevent reprocessing if subsequent steps fail
+		if err := imapClient.MarkAsAIProcessed(email); err != nil {
+			logger.WithFields(logrus.Fields{
+				"subject": email.Subject,
+				"error":   err,
+			}).Warn("Failed to mark email as AI-processed, continuing with draft save")
+			// Continue anyway - if this fails, worst case is we might reprocess
+			// But we want to try to save the draft we just generated
+		} else {
+			logger.Debug("Marked email as AI-processed")
+		}
+
 		// Save as draft
 		if err := imapClient.SaveDraft(email, response); err != nil {
 			logger.WithFields(logrus.Fields{