💻 Code: Modify the default behavior of API key cooldown, change it to default off for API key cooldown. When there is only one API key in the channel, it will not cooldown under any circumstances. When API_KEY_COOLDOWN_PERIOD is 0, it will not cooldown. After enabling cooldown, any error with the API key will trigger a cooldown.
✨ Feature: Add feature: Support model-level cooling. When a model under a channel reports an error, it does not affect other models under the same channel, only the model that reported the error is cooled.