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## Summary
Ports the Python password-reset flow to Go, adding 4 unauthenticated
endpoints under `/api/v1/auth/password/`:
- `POST /auth/password/forgot/captcha` — generates and returns a PNG
captcha image; stores the plaintext code in Redis (60 s TTL)
- `POST /auth/password/forgot/otp` — verifies captcha, enforces resend
cooldown (60 s), generates HMAC-SHA256-hashed OTP (300 s TTL), sends
plain-text email via SMTP
- `POST /auth/password/forgot/otp/verify` — verifies OTP with attempt
counting (lock after 5 failures for 30 min), sets a
`otp:verified:{email}` flag (300 s TTL) on success
- `POST /auth/password/reset` — checks verified flag, decrypts +
validates passwords, updates user record, auto-logs in (issues JWT,
returns user profile)
Closes #15282