Adds rate_limit(name, max_hits=, window_seconds=) as a factory for FastAPI
dependencies, generalizing the auth_rate_limit pattern for future endpoints
(chat send, message report) without touching auth_rate_limit's own behavior.
Reuses SlidingWindowLimiter for counting and the existing 429 + Retry-After
response, and respects RATE_LIMIT_ENABLED the same way auth_rate_limit does.
reset_all() now clears every registered limiter (auth's plus any named ones),
so the conftest autouse fixture keeps working for sibling tasks automatically.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Y2FESCaMXeJpC9gSctiEeD
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