* 🐛 fix(channel): evict auto-disabled multi-key channels from cache
Ensure multi-key channels are removed from the in-memory routing cache when all keys become auto-disabled, preventing subsequent requests from repeatedly selecting channels with no available keys.
Also make multi-key status updates more robust by handling missing key matches, checking actual enabled key availability, and restoring the channel status when a key is re-enabled. Add regression coverage for disabled cached channels and multi-key cache eviction.
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