Initialize Omvia Cloud

Omvia now requires a private .omviacloud vault outside public_html. Credentials, database, cloud sessions, logs, temporary uploads and backups never initialize inside the public web tree.

✓PHP 8.2+Ready
✓SQLite database driverReady
✓File type detectionReady
✓Secure cloud transportReady
✓Unicode text supportReady
✓Private vault outside public_htmlReady
✓Private vault configuration is validReady
✓Private PHP session storeReady
✓.omviacloud vault initializedReady
✓Legacy credentials removed from public_htmlReady