feat(crm): align shared attachment payloads

internal/handler/api/v1/conversation_serializer.go

@@ -304,17 +304,17 @@ func serializeMessage(ctx context.Context, db *gorm.DB, message *model.Message,
 		if err := db.WithContext(ctx).Where("message_id = ?", message.ID).Order("id ASC").Find(&attachments).Error; err == nil && len(attachments) > 0 {
 			payload.Attachments = make([]any, 0, len(attachments))
 			for i := range attachments {
-				payload.Attachments = append(payload.Attachments, serializeAttachment(&attachments[i]))
+				payload.Attachments = append(payload.Attachments, serializeAttachment(ctx, db, &attachments[i]))
 			}
 		}
 	}
 	return payload
 }
 
-func serializeAttachment(attachment *model.Attachment) map[string]any {
+func serializeAttachment(ctx context.Context, db *gorm.DB, attachment *model.Attachment) map[string]any {
 	extension := strings.TrimPrefix(filepath.Ext(attachment.FileName), ".")
 	dataURL := nonEmpty(attachment.FileURL, attachment.ExternalURL)
-	return map[string]any{
+	payload := map[string]any{
 		"id":         attachment.ID,
 		"message_id": attachment.MessageID,
 		"file_type":  attachment.FileType,
@@ -326,6 +326,52 @@ func serializeAttachment(attachment *model.Attachment) map[string]any {
 		"width":      attachment.Width,
 		"height":     attachment.Height,
 	}
+
+	message := attachment.Message
+	if message.ID == 0 && db != nil && attachment.MessageID != 0 {
+		_ = db.WithContext(ctx).First(&message, attachment.MessageID).Error
+	}
+	if !message.CreatedAt.IsZero() {
+		payload["created_at"] = message.CreatedAt.Unix()
+	}
+	if sender := serializeMessageSender(ctx, db, &message); sender != nil {
+		payload["sender"] = sender
+	}
+	return payload
+}
+
+func serializeAttachmentWithConversation(ctx context.Context, db *gorm.DB, attachment *model.Attachment) map[string]any {
+	payload := serializeAttachment(ctx, db, attachment)
+	message := attachment.Message
+	if message.ID == 0 && db != nil && attachment.MessageID != 0 {
+		_ = db.WithContext(ctx).First(&message, attachment.MessageID).Error
+	}
+	if db != nil && message.ConversationID != 0 {
+		var conversation model.Conversation
+		if err := db.WithContext(ctx).First(&conversation, message.ConversationID).Error; err == nil {
+			payload["conversation_id"] = conversationDisplayID(&conversation)
+		}
+	}
+	return payload
+}
+
+func serializeMessageSender(ctx context.Context, db *gorm.DB, message *model.Message) map[string]any {
+	if db == nil || message == nil || message.SenderID == nil || *message.SenderID == 0 {
+		return nil
+	}
+	senderType := strings.ToLower(message.SenderType)
+	if senderType == "contact" {
+		var contact model.Contact
+		if err := db.WithContext(ctx).First(&contact, *message.SenderID).Error; err == nil {
+			return serializeContact(&contact)
+		}
+		return nil
+	}
+	var user model.User
+	if err := db.WithContext(ctx).First(&user, *message.SenderID).Error; err == nil {
+		return serializeUser(&user, message.AccountID)
+	}
+	return nil
 }
 
 func serializeContact(contact *model.Contact) map[string]any {