fix(proxy): architectural overhaul for timeouts, 9k limits, and infinite hang prevention

Update proxy_cerebras.py

Update proxy_cerebras.py

Update proxy_cerebras.py

Update proxy_cerebras.py

Update proxy_cerebras.py

Update proxy_cerebras.py

Update proxy_cerebras.py

Force rebuild after delete

Delete proxy_cerebras.py with huggingface_hub

Fix: Handle MiniMax reasoning field in response

Replace proxy_cerebras.py with updated app.py code with Claude endpoint support