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/fileWatcher.js

@@ -2,6 +2,7 @@ const chokidar = require('chokidar');
 const path = require('path');
 const fs = require('fs').promises;
 const { db } = require('../database/db');
+const { formatBoolean } = require('../utils/dbCompat');
 const { generateThumbnail } = require('./imageProcessor');
 const logger = require('../utils/logger');
 
@@ -51,7 +52,7 @@ async function processNewPhoto(filePath) {
   if (!['.jpg', '.jpeg', '.png', '.webp'].includes(ext)) return;
   
   // Find the event
-  const event = await db('events').where({ slug: eventSlug, is_active: true }).first();
+  const event = await db('events').where({ slug: eventSlug, is_active: formatBoolean(true) }).first();
   if (!event) return;
   
   // Get file stats