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test_audio文件将TEST_AUDIO_URLS改为本地；testchat文件360行路径改为本地；test_metrics文件197行将base_url从0.0.0.0改为localhost；test_run_batch将INPUT_BATCH，INVALID_INPUT_BATCH,INPUT_EMBEDDING_BATCH改为原来的格式；test_tokenizer_group将18行的gpt路径改为修改后的路径；test_braodcast将model的判断改为if llava-hf/llava-1.5-7b-hf in model

add VLLM_OPTEST_MODELS_PATH/OPTEST_MODELS_PATH  to load models from local path instead of Hugging Face Hub

Co-authored-by: simon-mo <xmo@berkeley.edu>
Co-authored-by: Chang Su <chang.s.su@oracle.com>
Co-authored-by: Simon Mo <simon.mo@hey.com>
Co-authored-by: Roger Wang <136131678+ywang96@users.noreply.github.com>
Co-authored-by: Roger Wang <ywang@roblox.com>