feat: backend core — models, auth, CRUD, tests

backend/app/models/__init__.py

@@ -0,0 +1,16 @@
+# Import all models so Alembic can discover them for autogenerate
+from app.models.budget import Budget
+from app.models.category import Category, CategoryType
+from app.models.refresh_token import RefreshToken
+from app.models.transaction import Transaction, TransactionType
+from app.models.user import User
+
+__all__ = [
+    "User",
+    "Category",
+    "CategoryType",
+    "Transaction",
+    "TransactionType",
+    "Budget",
+    "RefreshToken",
+]