[Feature] Add AllGather-KV sequence-parallel attention str… (#4968)

Signed-off-by: zhuhh97 <zhuhonghan@huawei.com>
Signed-off-by: dph97 <nenbaying@163.com>
Signed-off-by: zhuhh97 <zhh@unknown>
Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>
Co-authored-by: dengyunyang <584797741@qq.com>

tests/diffusion/models/hunyuan_image3/test_image_kv_cache_manager.py

@@ -45,6 +45,8 @@ def patched_mgr_env(sp_size=1):
     target = _TRANSFORMER_MODULE
     patches = [
         patch(f"{target}.get_sequence_parallel_world_size", return_value=sp_size),
+        patch(f"{target}.get_allgather_parallel_world_size", return_value=sp_size),
+        patch(f"{target}.get_ulysses_parallel_world_size", return_value=1, create=True),
         patch(f"{target}.get_sequence_parallel_rank", return_value=0),
         patch(f"{target}.Attention", MockAttention),
     ]