fix: agent JSON format - switch from json_schema to json_object

fix: replace SimilarityMaps with manual atom highlight visualization

fix: SHAP explain - torch import, reduce samples, fix visualizer scale

fix: correct node features to 45-dim (exact one-hot + mass)

fix: correct Firebase project ID and remove debug logging

fix: add Firebase credential logging for debugging

fix: add libexpat1 for RDKit Draw

fix: update model architecture, features, config to match trained model

fix: update model to ResGATv2_JK_VN (node_dim=45, edge_dim=11, 10 tasks)

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