Update nvidia_llm to use minimaxai/minimax-m2.7 and new sampling params

Update nvidia_llm model, endpoint, stream=False, and remove hardcoded API key

Fix NameError in crew.py and add AI disclaimer to index.html

Fix nvidia_llm httpx connection leaks and improve crew.py retrieval logging

Replace gen_llm with nvidia_llm and add frontend test

Fix OOM crash causing missing jobs by limiting PyTorch concurrency

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