[Config Refactor][2/N] Pipeline + Deploy Config Schema (#2383)

Signed-off-by: lishunyang <lishunyang12@163.com>
Signed-off-by: reidliu41 <reid201711@gmail.com>
Signed-off-by: Alex Brooks <albrooks@redhat.com>
Co-authored-by: reidliu41 <reid201711@gmail.com>
Co-authored-by: xiaohajiayou <75477391+xiaohajiayou@users.noreply.github.com>
Co-authored-by: Alex Brooks <albrooks@redhat.com>
Co-authored-by: Hongsheng Liu <liuhongsheng4@huawei.com>

docs/contributing/profiling.md

@@ -127,10 +127,11 @@ Multi-stage omni serving:
 ```bash
 vllm serve Qwen/Qwen2.5-Omni-7B \
   --omni \
-  --stage-configs-path qwen2_5_omni.yaml \
   --port 8091
 ```
 
+(The default deploy config at `vllm_omni/deploy/qwen2_5_omni.yaml` is loaded automatically. Pass `--deploy-config /path/to/custom.yaml` to override.)
+
 Single-stage diffusion serving with torch profiler:
 
 ```bash