feat: optimize model loading, clean imports, run V4 training and fix tests

cleanup: retrait fichiers internes du tracking HF + ajout .gitignore + update app.py SMOTE

maj train_V4

MAJ LGBM

edit ticket

maj app

maj requirements

logo maj

maj lgbm model

add pkl

edit final

v final

Fix: Securisation du chargement du modele

Fix: Forçage mode sombre premium

MAJ

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