feat: Add GetAverageDifficultyForVideo query

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

src/operations/video.gql

@@ -61,6 +61,7 @@ query GetVideoDetails($videoId: Int!) {
     endTime
     makePercentage
     medianRun
+    averageDifficulty
     startTime
     totalShots
     totalShotsMade
@@ -211,6 +212,13 @@ query GetMedianRunForVideo($videoId: Int!) {
   }
 }
 
+query GetAverageDifficultyForVideo($videoId: Int!) {
+  getVideo(videoId: $videoId) {
+    id
+    averageDifficulty
+  }
+}
+
 fragment StreamWithEndFrames on UploadStreamGQL {
   id
   streamSegmentType