fix: comprehensive boolean compatibility for PostgreSQL and SQLite

- Add formatBoolean() usage to all boolean database queries
- Fix 36 boolean comparisons across 18 backend files
- Ensure compatibility between SQLite (0/1) and PostgreSQL (true/false)
- Update all WHERE clauses and UPDATE operations with boolean values

This completes the database compatibility fixes for production deployment.
All boolean operations now work correctly with both database systems.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

backend/src/services/expirationChecker.js

@@ -75,7 +75,7 @@ async function queueExpirationWarning(event) {
 async function handleExpiredEvent(event) {
   try {
     // Mark as inactive
-    await db('events').where('id', event.id).update({ is_active: false });
+    await db('events').where('id', event.id).update({ is_active: formatBoolean(false) });
     
     // Queue expiration emails
     await queueEmail(event.id, event.host_email, 'gallery_expired', {