good first issuepriority: medium
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説明
Description
As a system, I want to validate that a user-provided email exists in the database so that I can ensure password reset requests are legitimate.
Acceptance Criteria
- The system checks if the provided email is associated with an existing account.
- If the email is not found, the system returns a generic message to avoid exposing account existence.
- Validation attempts are logged for auditing purposes.