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/middleware/auth-enhanced.js

@@ -1,5 +1,6 @@
 const jwt = require('jsonwebtoken');
 const { db } = require('../database/db');
+const { formatBoolean } = require('../utils/dbCompat');
 const logger = require('../utils/logger');
 
 /**
@@ -50,7 +51,7 @@ async function adminAuth(req, res, next) {
     
     // Check if admin still exists and is active
     const admin = await db('admin_users')
-      .where({ id: decoded.id, is_active: true })
+      .where({ id: decoded.id, is_active: formatBoolean(true) })
       .first();
     
     if (!admin) {
@@ -165,7 +166,7 @@ async function photoAuth(req, res, next) {
     // Allow both admin and gallery tokens
     if (decoded.type === 'admin') {
       const admin = await db('admin_users')
-        .where({ id: decoded.id, is_active: true })
+        .where({ id: decoded.id, is_active: formatBoolean(true) })
         .first();
       
       if (!admin) {