feat: Release version 1.3.7 with user permissions security fix

- Update APP_VERSION to 1.3.7 in app.js
- Update Docker image version to marcogll/ap_pos:1.3.7 in docker-compose.yml
- Minor patch release focusing on user role security improvements

Docker images published:
- marcogll/ap_pos:1.3.7 (new version)
- marcogll/ap_pos:latest (updated)

Security enhancements included:
✅ Proper dashboard/settings access control
✅ Sales deletion restricted to admin only
✅ Correct initial tab routing by role
✅ Fixed UI permission selectors

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

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

app.js

@@ -528,7 +528,7 @@ function formatDate(dateString) {
     return `${day}/${month}/${year}`;
 }
 
-const APP_VERSION = '1.3.6';
+const APP_VERSION = '1.3.7';
 
 // --- ESTADO Y DATOS ---
 const DEFAULT_SETTINGS = {