fix(bench): use force_push instead of push in video_queue bench_push

Production code (io_loop.rs:1310) always uses force_push which drops
the oldest frame when the queue is full. The benchmark was using push()
which silently fails on a full queue.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

libs/scrap/benches/video_queue.rs

@@ -45,7 +45,8 @@ fn bench_push(c: &mut Criterion) {
         let q = ArrayQueue::new(QUEUE_CAP);
         b.iter(|| {
             for f in &frames {
-                let _ = q.push(black_box(f.clone()));
+                // Real code uses force_push (io_loop.rs:1310)
+                q.force_push(black_box(f.clone()));
             }
             // Drain for next iteration
             while q.pop().is_some() {}