simplified message model

backend/services/email/domain/MessagingEmailService.js

@@ -39,7 +39,6 @@ class MessagingEmailService {
    * @param {string} sender.firstName - Sender's first name
    * @param {string} sender.lastName - Sender's last name
    * @param {Object} message - Message object
-   * @param {string} message.subject - Message subject
    * @param {string} message.content - Message content
    * @param {Date} message.createdAt - Message creation timestamp
    * @returns {Promise<{success: boolean, messageId?: string, error?: string}>}
@@ -61,7 +60,6 @@ class MessagingEmailService {
       const variables = {
         recipientName: receiver.firstName || "there",
         senderName: `${sender.firstName} ${sender.lastName}`.trim() || "A user",
-        subject: message.subject,
         messageContent: message.content,
         conversationUrl: conversationUrl,
         timestamp: timestamp,