Add details to proxy config

[Christof Marti (chrmarti)]

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[Copilot]

Pull request overview

Adds richer proxy configuration diagnostics across Rust and Node.js APIs.

Changes:

• Reports environment proxy variables and per-source PAC status.
• Adds Windows DHCP WPAD discovery and distinguishes DHCP/DNS sources.
• Updates bindings, types, tests, and documentation.

Show a summary per file

File	Description
src/wpad.rs	Adds DNS WPAD source/status reporting.
src/types.rs	Defines diagnostic configuration types.
src/resolver.rs	Inspects and prioritizes PAC sources.
src/platform/windows.rs	Adds DHCP WPAD URL detection.
src/platform/mod.rs	Exposes Windows DHCP detection.
src/lib.rs	Exports new public types and updates docs.
src/env_cfg.rs	Captures environment diagnostics.
README.md	Documents expanded configuration inspection.
npm/test/smoke.js	Tests the expanded Node.js response.
npm/native/src/lib.rs	Maps diagnostics into Node.js objects.
index.d.ts	Defines the expanded TypeScript API.

Review details

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• Files reviewed: 10/11 changed files
• Comments generated: 2
• Review effort level: Medium