[Doc][TTS] CosyVoice3 online docs + residual TTS yaml cleanup + remove VoxCPM v1 (#3748)

Signed-off-by: Yueqian Lin <linyueqian@outlook.com>

pyproject.toml

@@ -63,7 +63,7 @@ dev = [
     "funasr>=1.0.0",
     "lpips>=0.1.4", # for quantization fp8
     "orjson>=3.11.7", # to make v1/embeddings API fast
-    "voxcpm>=2.0.2", # for voxcpm model Test
+    "voxcpm>=2.0.2", # for VoxCPM2 path-locating in tests
     "torchdiffeq>=0.2.5" # for covo_audio Test
 ]