Add via-in-pad autorouter opt-in

[AnasSarkiz]

Summary

• add allowViaInPad?: boolean to AutorouterConfig
• validate the option through the public autorouter Zod schema
• document that omitted or false keeps via-in-pad routing disabled
• regenerate the component-types and props-overview documentation

Why

Via-in-pad manufacturing can incur additional fabrication cost, so it should be an explicit autorouter opt-in. This props change establishes the user-facing API for the downstream Circuit JSON, core, and capacity-autorouter integrations.

This PR only introduces the props contract; it does not enable via-in-pad routing by itself.

Validation

• bun test — 386 pass, 0 fail
• bun run typecheck
• bun run build
• bun run format:check
• bun run check-circular-deps
• all required documentation generators

[tscircuitbot]

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Thank you for your contribution! 🎉

PR Rating: ⭐⭐
Impact: Minor

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