Support Apple’s URL filtering

### Issue Details

Developer documentation: https://developer.apple.com/documentation/networkextension/url-filters
WWDC: https://developer.apple.com/videos/play/wwdc2025/234/
Discussion: https://developer.apple.com/forums/thread/787657
>In iOS, iPadOS and macOS 26, you can now build robust content filters that make traffic decisions using the entire URL — not just the hostname — all without compromising privacy and security.

This can be a better alternative to the current local VPN filtering approach because it works with WireGuard/OpenVPN VPNs, and it works with the entire URL instead of just the domain.
Another famous iOS adblocker is also looking into this new API.

### Proposed solution

Implement URL filtering.

### Alternative solution

https://github.com/AdguardTeam/AdguardForiOS/issues/2317