- Implemented organization creation, editing, and activity management in orgs.php.
- Added safe path segment function to sanitize input.
- Included file upload handling for activity photos.
- Created a new logo image for the application.
- Introduced `safe_id_segment`, `safe_centro_id`, and `safe_aulario_config_path` functions to sanitize input and construct file paths securely.
- Updated `index.php`, `paneldiario.php`, `proyectos.php`, `aularios.php`, `centros.php`, `club_mkthumb.php`, `reset_password.php`, and `users.php` to utilize new sanitization functions.
- Enhanced error handling for file existence checks and directory traversal prevention.
- Ensured consistent use of safe path handling in user input across the application.
