fix(compatibility): resolve python 3.12 compatibility NameErrors and SyntaxErrors

feat: synchronize proxy with upstream commits up to 5305bd7 and integrate NIM key rotator

fix: replace super() with explicit calls to prevent async Python 3.12+ bug and suppress HEAD / logs

Fix _PrefetchedStream asyncio task cancellation bug

Fix HF Space timeouts and infinite rotation loops

Deploy latest upstream with key rotation, vision adapter, and HF configs

Deploy to Hugging Face Space