Type authenticatorResponse in services.ts, cast at server.ts boundary

[cfuehrmann]

Summary

• Types the authenticatorResponse parameter properly in services.ts using RegistrationResponseJSON / AuthenticationResponseJSON from @simplewebauthn/server
• Moves the unknown → typed cast to server.ts where the public API boundary (unknown) meets the typed internals
• Eliminates 3 as any casts and their eslint-disable comments from services.ts

Rationale

server.ts (createAuth public API) stays unknown to avoid coupling consumers to @simplewebauthn/server types. But services.ts is internal to the auth package and already depends on @simplewebauthn/server transitively — so it should be properly typed. The casts now live at the correct boundary in server.ts.

Files changed (2)

• packages/fido2-auth/src/services.ts — proper types, no more as any
• packages/fido2-auth/src/server.ts — as RegistrationResponseJSON / as AuthenticationResponseJSON at boundary

Checks

• Build passes
• Lint passes
• Format passes
• Knip passes
• Unit tests pass
• All 11 e2e tests pass