Add potion-base-8M config.json (model2vec lightweight preset; MIT, minishlab)

potion-base-8m/config.json

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+{"model_type": "model2vec", "architectures": ["StaticModel"],"tokenizer_name": "baai/bge-base-en-v1.5", "apply_pca": 256, "apply_zipf": true, "hidden_dim": 256, "seq_length": 1000000, "normalize": true}