- Add dedicated 'confirmation_email' (type=email, required) field
to student form at end of submission (partage + admin).
- ThesisCreateController now validates it is present and a valid
email; form is rejected if missing/invalid.
- Autofocus mapping for confirmation_email errors.
- StudentEmail uses confirmation_email directly (removed extractEmail
hack that mined email from free-form contact field).
- Remove require_once for config/config.php (file was never deployed — outside app/)
- Inline DB path resolution directly in Database::determineDatabasePath()
- Uses APP_ROOT when defined (bootstrap already loaded), falls back to __DIR__/../
- DB_ENV=test|prod env-var override preserved for tests
- php -S cli-server -> test.db, nginx/fpm -> posterg.db
