Make PAC backends platform-aware

[Christof Marti (chrmarti)]

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[Copilot]

Pull request overview

Unifies PAC/WPAD resolution by enabling embedded PAC backends on Windows while retaining WinHTTP for backend-less builds.

Changes:

• Routes Windows PAC evaluation and DNS WPAD through embedded backends.
• Shares PAC fetching across platforms.
• Updates CI, examples, licensing, and documentation.

Show a summary per file

File	Description
Cargo.toml	Makes ureq cross-platform and updates feature guidance.
src/resolver.rs	Selects embedded or WinHTTP resolution paths.
src/platform/windows.rs	Limits WinHTTP PAC APIs to backend-less builds.
src/platform/mod.rs	Conditionally exports the WinHTTP resolver.
src/fetch.rs	Uses the shared ureq fetcher on Windows.
src/wpad.rs	Documents Windows WPAD behavior.
src/pac/mod.rs	Documents cross-platform PAC evaluation.
src/types.rs	Updates PAC backend API documentation.
src/lib.rs	Updates platform behavior documentation.
examples/proxytester.rs	Handles local PAC files by backend configuration.
examples/pac_bench.rs	Separates WinHTTP and embedded benchmarks.
.github/workflows/ci.yml	Builds and benchmarks the new Windows variants.
README.md	Documents unified backend behavior.
LICENSE.txt	Updates QuickJS platform scope.
ThirdPartyNotices.txt	Regenerates dependency notices.
about.toml	Updates notice-generation guidance.
about.hbs	Updates generated notice text.

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• Files reviewed: 17/17 changed files
• Comments generated: 1
• Review effort level: Medium