[Bugfix][MiniCPM-o] Stabilize code2wav CFM CUDA graph caching with reference audio normalization and mel-frame bucketing (#7416)

Signed-off-by: y_null <y_null@qq.com>
Co-authored-by: amy-why-3459 <wuhaiyan17@huawei.com>

vllm_omni/deploy/minicpmo_4_5_8x4090.yaml

@@ -19,7 +19,6 @@ async_chunk: true
 # (/v1/realtime?duplex=1). The default duplex_session caps sessions at 1,
 # matching Stage 0/1 max_num_seqs below.
 session_mode: duplex
-active_stream_window: 1
 
 trust_remote_code: true
 enable_prefix_caching: false
@@ -40,6 +39,7 @@ connectors:
       enable_hift_graph: true
       enable_cfm_graph: true
       cfm_max_graphs: 32
+      cfm_graph_bucket_frames: 16
 
 stages:
   - stage_id: 0