feat(pose_3d): /state espone blocco cross_camera

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/presa_mano/api/pose_3d_routes.py

@@ -105,6 +105,7 @@ def get_state() -> dict[str, Any]:
         "right_wrist_camera": cfg.get("right_wrist_camera") or {},
         "clouds": cfg.get("clouds") or {},
         "cloud_params": cfg.get("cloud_params") or {},
+        "cross_camera": cfg.get("cross_camera") or {},
         "timings_ms": sw.as_dict(),
     }