fix: sort imports with Ruff

Author: adityacosmos24

src/quant_research_starter/factors/volatility.py

@@ -20,12 +20,11 @@
 
 from __future__ import annotations
 
+from typing import Optional
 
 import numpy as np
 import pandas as pd
 
-from typing import Optional
-
 # Try to import package Factor base; fallback to a minimal stub if unavailable.
 try:
     # Adjust this import if your project stores Factor in a different module.