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/routes/auth-enhanced-v2.js

@@ -3,6 +3,7 @@ const bcrypt = require('bcrypt');
 const jwt = require('jsonwebtoken');
 const { body, validationResult } = require('express-validator');
 const { db } = require('../database/db');
+const { formatBoolean } = require('../utils/dbCompat');
 const { verifyRecaptcha } = require('../services/recaptcha');
 const { 
   trackFailedAttempt,
@@ -248,7 +249,7 @@ router.post('/gallery/verify', [
       return res.status(400).json({ error: 'reCAPTCHA verification failed' });
     }
     
-    const event = await db('events').where({ slug, is_active: true, is_archived: false }).first();
+    const event = await db('events').where({ slug, is_active: formatBoolean(true), is_archived: formatBoolean(false) }).first();
     if (!event) {
       // Don't reveal if gallery exists
       await trackFailedAttempt(`gallery:${slug}`, ipAddress, userAgent);