Staging login transport verification

• Checked: 2026-08-25 (GMT+9)
• Served frontend asset observed: assets/index-n7bojuBa.js.
• The normal administrator login form was tested with deliberately invalid credentials. It rendered the expected application message, 관리자 아이디 또는 비밀번호가 올바르지 않습니다., rather than the server response Unsupported GET-request to mutation procedure.
• This verifies that the normal submit button's current client-side path reaches the auth.login mutation with a supported request method. No database state was modified during this check.
• A historical or manually opened GET /api/trpc/auth.login request remains correctly rejected by the server with HTTP 405 because login is a mutation and must use POST.