fix(dependencies): add missing ML dependencies for HuggingFace Spaces

Add joblib, shap, and mlflow to requirements.txt to fix
ModuleNotFoundError in HuggingFace Spaces deployment

requirements.txt

@@ -43,4 +43,9 @@ reportlab>=4.0.9
 openpyxl>=3.1.2
 markdown>=3.5.1
 beautifulsoup4>=4.12.2
-weasyprint>=60.2
+weasyprint>=60.2
+
+# ML dependencies
+joblib>=1.3.2
+shap>=0.43.0
+mlflow>=2.9.0