Security: Throttle login attempts with a per-address, per-account token bucket

Nothing stopped a bot from trying passwords against /webadmin as fast
as bcrypt would go. A small in-memory limiter (stdlib only, one
process) now refuses a login with 429 once an address, or an account,
has made ten attempts, and lets one more through every six seconds;
keying on both means many addresses guessing one account are throttled
too. Refusals are logged.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Sd8UPWrvyYCLj97JexNw3A

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