Fix variable name conflict in getPointsAwardEntityBreakdown

Rename 'stations' variable to 'stationList' to avoid conflict with
destructured 'stations' from rules.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/backend/services/awards.service.js

@@ -303,8 +303,8 @@ async function getPointsAwardEntityBreakdown(userId, rules) {
     }
   }
 
-  const stations = Array.from(stationMap.values());
-  const confirmedStations = stations.filter((s) => s.confirmed);
+  const stationList = Array.from(stationMap.values());
+  const confirmedStations = stationList.filter((s) => s.confirmed);
   const totalPoints = confirmedStations.reduce((sum, s) => sum + s.points, 0);
 
   return {
@@ -313,8 +313,8 @@ async function getPointsAwardEntityBreakdown(userId, rules) {
       name: 'Special Stations Award',
       description: 'Contact special stations to earn points',
     },
-    entities: stations,
-    total: stations.length,
+    entities: stationList,
+    total: stationList.length,
     confirmed: confirmedStations.length,
     totalPoints,
   };