Allow passing options to Channel.createInvite

[GalaxyAkiii]

Related to stoatchat/for-web#1637 and stoatchat/for-web#1678

Summary

Allows passing invite options (max_uses, expires) when creating invites via Channel.createInvite(), and exposes the corresponding usage and expiration fields on ServerInvite.

Changes

• Updated Channel.createInvite(data: DataCreateInvite = {}) to forward the options payload to POST /channels/{id}/invites.
• Exposed uses, maxUses (from API max_uses), and expires (parsed as Date) on ServerInvite.

Notes for Reviewers

• The new ServerInvite fields use an inline cast (invite as { ... }) because the stoat-api version this SDK depends on (0.15.3) does not yet include the invite schema from backend PR feat: invite expiry and max use limit stoatchat#986. The schema is present on stoatchat/javascript-client-api main but unreleased, so the cast can be removed once a new release includes it.
• CI typecheck will fail on DataCreateInvite until that release is published and the SDK's stoat-api dependency is bumped.

Testing

Verified against a live backend instance running stoatchat/stoatchat#986:

• Created invites with max_uses (e.g. 5) and expiration timestamps, verifying they were accepted and applied.
• Verified through the web client that fetched server invites reflect the new fields: an invite created with max_uses: 5 and a 1-day expiry displays 0 / 5 with the expected expiry date, and an unlimited invite displays 0 uses with no expiry.
• Verified single-use invites invalidate upon join.