* Refresh all S3 avatars for this user's accessible agent set, not the first page
* Cleaner debug messages
* Log errors as errors
* refactor: avatar refresh logic to process agents in batches and improve error handling. Introduced new utility functions for refreshing S3 avatars and updating agent records. Updated tests to cover various scenarios including cache hits, user ownership checks, and error handling. Added constants for maximum refresh limits.
* refactor: update avatar refresh logic to allow users with VIEW access to refresh avatars for all accessible agents. Removed checks for agent ownership and author presence, and updated related tests to reflect new behavior.
* chore: Remove YouTube toolkit due to #11331
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Co-authored-by: Danny Avila <danny@librechat.ai>
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