Add ad blocking backed by sing-box ruleset

[atavism]

No description provided.

[Copilot]

Pull Request Overview

This PR adds ad blocking functionality backed by sing-box rulesets. The implementation uses a logical gate mechanism to enable/disable ad blocking dynamically, with state persisted to disk.

Key Changes:

• New AdBlocker component manages ad blocking state using logical gates (AND=disabled, OR=enabled)
• Integration with sing-box routing rules to block ad-related traffic
• Public API methods added to Radiance for enabling/disabling ad blocking

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
vpn/adblocker.go	Core ad blocking logic with state management and persistence
vpn/adblocker_test.go	Comprehensive tests for ad blocker initialization, enable/disable, and persistence
vpn/boxoptions.go	Integration of ad block rules into sing-box routing configuration
radiance.go	Public API for ad blocking control and AdBlocker initialization
go.mod	Promoted miekg/dns and sagernet/sing-tun from indirect to direct dependencies

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[Copilot]

If vpn.NewAdBlocker() fails, the error is logged but execution continues with a nil adBlocker. This means r.adBlocker will be nil, but the Radiance instance is still created and returned successfully. While the public methods AdBlockEnabled() and SetAdBlockEnabled() do handle nil checks, it would be clearer to either:

1. Return an error from NewRadiance() if ad blocker initialization is critical, or
2. Document this behavior explicitly that ad blocking is optional and may be unavailable