FlyingPress 4.15.9

- Improvement: Display alerts after importing configurations and activating license
- Improvement: Simplify smart link preloading for enhanced performance
- Fix: The admin bar was not displaying for logged-in users in certain cases when FlyingCDN is active

- Improvement: Prevent pages from downloading as gzip on OpenLiteSpeed servers
- Improvement: Refactor WPML integration to improve performance
- Improvement: Preload pages with appropriate user agent for greater compatibility
- Fix: Remove unwanted encoded string from `cache_bust` query parameter that caused invalid URLs

- Improvement: Use mime module as a fallback to prevent pages from downloading as gzip
- Fix: A warning about an undefined array key `HTTP_HOST` while purging FlyingCDN cache in the CLI context
- Fix: Element attribute values were incorrectly captured by the HTML parser in certain cases