fix(misskey-js): type fixes related to signup and signin

[zyoshoka]

What

• /signup と /signin エンドポイントに関する型が古いのを更新
• /signin-with-passkey エンドポイントのレスポンスの型を正確化

Why

正確な型の提供

Additional info (optional)

Checklist

• [x] Read the contribution guide
• [ ] Test working in a local environment
• [ ] (If needed) Add story of storybook
• [ ] (If needed) Update CHANGELOG.md
• [ ] (If possible) Add tests

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 9 lines in your changes missing coverage. Please review.

Project coverage is 41.49%. Comparing base (a722ea8) to head (6bacb68). Report is 3 commits behind head on develop.

Files with missing lines	Patch %	Lines
...ackages/backend/src/server/api/ApiServerService.ts	0.00%	7 Missing :warning:
packages/frontend/src/components/MkSignin.vue	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #14679 +/- ## =========================================== + Coverage 39.68% 41.49% +1.80% =========================================== Files 1545 1549 +4 Lines 193848 199644 +5796 Branches 2563 3607 +1044 =========================================== + Hits 76926 82838 +5912 + Misses 116357 116211 -146 - Partials 565 595 +30 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[github-actions[bot]]

このPRによるapi.jsonの差分 差分はありません。 Get diff files from Workflow Page

[syuilo]

🙏🏻