Add VideoPlayerClusters query + FinalizePlayerAssignments mutation

Operation file for the per-video player-labeling UI that consumes the
schema types added in #240.

  - VideoPlayerClusters($videoId): read clusters + crops
  - FinalizePlayerAssignments($input): apply user assignments and
    shot moves in one transaction

Generated by `just gql`.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/operations/shooter.gql

@@ -0,0 +1,34 @@
+fragment PlayerClusterShotFields on PlayerClusterShotGQL {
+  shotId
+  bboxX1
+  bboxY1
+  bboxX2
+  bboxY2
+  confidence
+  isConfirmed
+  cropUrl
+  fullFrameUrl
+}
+
+fragment PlayerClusterFields on PlayerClusterGQL {
+  videoId
+  clusterId
+  nShots
+  userId
+  confirmed
+  shots {
+    ...PlayerClusterShotFields
+  }
+}
+
+query VideoPlayerClusters($videoId: Int!) {
+  videoPlayerClusters(videoId: $videoId) {
+    ...PlayerClusterFields
+  }
+}
+
+mutation FinalizePlayerAssignments($input: FinalizePlayerAssignmentsInput!) {
+  finalizePlayerAssignments(input: $input) {
+    ...PlayerClusterFields
+  }
+}