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The updateRateLimitUsageScript Lua script previously performed
unconditional HINCRBYFLOAT on all usage counters without checking
whether the rate limit window had expired. This caused usage to
accumulate across window boundaries in Redis while the DB correctly
reset on expiration, leading to incorrect 429 rate limiting that
could persist for up to 24 hours.

The Lua script now checks each window timestamp before incrementing:
- If the window has expired, usage is reset to the current cost and
  the window timestamp is updated (matching DB-side semantics)
- If the window is still valid, usage is accumulated normally

This also resolves the async race condition where stale HINCRBYFLOAT
tasks from the worker queue could pollute a freshly rebuilt cache
after invalidation, since the script now self-corrects expired windows.

Closes #1049