ユーザー登録 API 叩く

[h-takeyeah]

ユーザー登録 API を叩けるはず

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Visit the preview URL for this PR (updated for commit debcf68):

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[h-takeyeah]

authStore 使ってないっぽい？消しますか？

https://github.com/szpp-dev-team/szpp-judge-frontend/blob/838ff6b52ade73a6df51882e3680eb712392c742/src/pages/register.vue#L73