fixed lint errors

app/services/sr_service.py

@@ -237,7 +237,7 @@ def cluster_sr_zones(
 
     for level in sorted_levels[1:]:
         # Compute current cluster midpoint
-        prices = [l["price_level"] for l in current_cluster]
+        prices = [lvl["price_level"] for lvl in current_cluster]
         cluster_low = min(prices)
         cluster_high = max(prices)
         cluster_mid = (cluster_low + cluster_high) / 2.0
@@ -259,11 +259,11 @@ def cluster_sr_zones(
     # 3. Compute zone for each cluster
     zones: list[dict] = []
     for cluster in clusters:
-        prices = [l["price_level"] for l in cluster]
+        prices = [lvl["price_level"] for lvl in cluster]
         low = min(prices)
         high = max(prices)
         midpoint = (low + high) / 2.0
-        strength = min(100, sum(l["strength"] for l in cluster))
+        strength = min(100, sum(lvl["strength"] for lvl in cluster))
         level_count = len(cluster)
 
         # 4. Tag zone type