[Feature][MiniCPM-o] Support configurable concurrent duplex sessions (#6021)

Signed-off-by: natureofnature <wzliu@connect.hku.hk>

pyproject.toml

@@ -73,6 +73,8 @@ dev = [
     "FlagEmbedding==1.4.0", # for hunyuan_image3 tests
     "kernels==0.14.1", # for accuracy tests comparison with diffusers output (0.15.0 incompatible with diffusers 0.38.0)
     "s3tokenizer==0.3.0", # for tts test
+    # Provides top-level cosyvoice2; do not co-install stepaudio2-minicpmo,
+    # whose top-level stepaudio2 package conflicts with this distribution.
     "step-audio2==1.0.0", # Step-Audio2 / MiniCPM-o 4.5 Token2Wav (flashcosyvoice / hyperpyyaml)
 ]