Fix: Revert deploy_config to original + fix name_to_id_mappings encoding

Fix: Regenerate deploy_config with correct school_stats

Upgrade to V38.2-PRO-V11: 3-model ensemble (CB+LGB+XGB x 5 seeds), 131 features

Upgrade to V18b: single CatBoost model with 154 features, school/major lookup tables

Upload folder using huggingface_hub