app.use('/api/auth/login', rateLimit(...)) etc. keyed on req.path, which Express strips to
'/' for mounted middleware - so /login, /register, /totp/verify shared ONE per-IP counter
(coupled limits; the new /totp/verify brute-force limit was not actually independent). Key
on originalUrl instead. Also adds the /api/auth/totp/verify 10/min limit (tightening #2).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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