Email queue + async sending; legal settings and placeholders

- Add in-memory email queue with rate limiting (MAX_EMAILS_PER_HOUR)
- Bulk send to event attendees now queues and returns immediately
- Frontend shows 'Emails are being sent in the background'
- Legal pages, settings, and placeholders updates

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/src/lib/email.ts

@@ -10,6 +10,7 @@ import {
   defaultTemplates,
   type DefaultTemplate 
 } from './emailTemplates.js';
+import { enqueueBulkEmails, type TemplateEmailJobParams } from './emailQueue.js';
 import nodemailer from 'nodemailer';
 import type { Transporter } from 'nodemailer';
 
@@ -1173,6 +1174,100 @@ export const emailService = {
       errors,
     };
   },
+
+  /**
+   * Queue emails for event attendees (non-blocking).
+   * Adds all matching recipients to the background email queue and returns immediately.
+   * Rate limiting and actual sending is handled by the email queue.
+   */
+  async queueEventEmails(params: {
+    eventId: string;
+    templateSlug: string;
+    customVariables?: Record<string, any>;
+    recipientFilter?: 'all' | 'confirmed' | 'pending' | 'checked_in';
+    sentBy: string;
+  }): Promise<{ success: boolean; queuedCount: number; error?: string }> {
+    const { eventId, templateSlug, customVariables = {}, recipientFilter = 'confirmed', sentBy } = params;
+
+    // Validate event exists
+    const event = await dbGet<any>(
+      (db as any)
+        .select()
+        .from(events)
+        .where(eq((events as any).id, eventId))
+    );
+
+    if (!event) {
+      return { success: false, queuedCount: 0, error: 'Event not found' };
+    }
+
+    // Validate template exists
+    const template = await this.getTemplate(templateSlug);
+    if (!template) {
+      return { success: false, queuedCount: 0, error: `Template "${templateSlug}" not found` };
+    }
+
+    // Get tickets based on filter
+    let ticketQuery = (db as any)
+      .select()
+      .from(tickets)
+      .where(eq((tickets as any).eventId, eventId));
+
+    if (recipientFilter !== 'all') {
+      ticketQuery = ticketQuery.where(
+        and(
+          eq((tickets as any).eventId, eventId),
+          eq((tickets as any).status, recipientFilter)
+        )
+      );
+    }
+
+    const eventTickets = await dbAll<any>(ticketQuery);
+
+    if (eventTickets.length === 0) {
+      return { success: true, queuedCount: 0, error: 'No recipients found' };
+    }
+
+    // Get site timezone for proper date/time formatting
+    const timezone = await this.getSiteTimezone();
+
+    // Build individual email jobs for the queue
+    const jobs: TemplateEmailJobParams[] = eventTickets.map((ticket: any) => {
+      const locale = ticket.preferredLanguage || 'en';
+      const eventTitle = locale === 'es' && event.titleEs ? event.titleEs : event.title;
+      const fullName = `${ticket.attendeeFirstName} ${ticket.attendeeLastName || ''}`.trim();
+
+      return {
+        templateSlug,
+        to: ticket.attendeeEmail,
+        toName: fullName,
+        locale,
+        eventId: event.id,
+        sentBy,
+        variables: {
+          attendeeName: fullName,
+          attendeeEmail: ticket.attendeeEmail,
+          ticketId: ticket.id,
+          eventTitle,
+          eventDate: this.formatDate(event.startDatetime, locale, timezone),
+          eventTime: this.formatTime(event.startDatetime, locale, timezone),
+          eventLocation: event.location,
+          eventLocationUrl: event.locationUrl || '',
+          ...customVariables,
+        },
+      };
+    });
+
+    // Enqueue all emails for background processing
+    enqueueBulkEmails(jobs);
+
+    console.log(`[Email] Queued ${jobs.length} emails for event "${event.title}" (filter: ${recipientFilter})`);
+
+    return {
+      success: true,
+      queuedCount: jobs.length,
+    };
+  },
   
   /**
    * Send a custom email (not from template)
@@ -1183,10 +1278,11 @@ export const emailService = {
     subject: string;
     bodyHtml: string;
     bodyText?: string;
+    replyTo?: string;
     eventId?: string;
-    sentBy: string;
+    sentBy?: string | null;
   }): Promise<{ success: boolean; logId?: string; error?: string }> {
-    const { to, toName, subject, bodyHtml, bodyText, eventId, sentBy } = params;
+    const { to, toName, subject, bodyHtml, bodyText, replyTo, eventId, sentBy = null } = params;
     
     const allVariables = {
       ...this.getCommonVariables(),
@@ -1208,7 +1304,7 @@ export const emailService = {
       subject,
       bodyHtml: finalBodyHtml,
       status: 'pending',
-      sentBy,
+      sentBy: sentBy || null,
       createdAt: now,
     });
     
@@ -1218,6 +1314,7 @@ export const emailService = {
       subject,
       html: finalBodyHtml,
       text: bodyText,
+      replyTo,
     });
     
     // Update log