Add home feed and isFollowedByCurrentUser field

- Add home option to VideoFeedInputGQL for automatic feed selection
- Add hasFollowing field to VideoHistoryGQL response
- Add isFollowedByCurrentUser field to UserGQL to replace followers N+1

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

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

src/schema.gql

@@ -374,6 +374,7 @@ type UserGQL {
   agreesToMarketing: Boolean
   following: [UserGQL!]
   followers: [UserGQL!]
+  isFollowedByCurrentUser: Boolean
 }
 
 type ShotGQL {