feat: Add HyperCLOVAX Vision Decoder diffusion model support to vllm-omni

benchmarks/hcx-omni/README.md

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+# HyperCLOVAX-SEED-Omni-8B Benchmarks
+
+Measures end-to-end latency and throughput for:
+
+| Mode | Input → Output |
+|------|----------------|
+| T2T  | Text → Text (thinker only) |
+| T2V  | Text → Text + Image |
+| S2S  | Audio + Text → Text + Audio |
+
+## Prerequisites
+
+Start the server first:
+
+```bash
+cd examples/online_serving/hcx_omni
+./run_server.sh --model naver-hyperclovax/HyperCLOVAX-SEED-Omni-8B
+```
+
+## Run Benchmarks
+
+```bash
+# All modes (10 requests each, sequential)
+bash benchmarks/hcx-omni/run_benchmark.sh
+
+# Custom settings via env vars
+NUM_PROMPTS=50 CONCURRENCY=4 MODE=t2v bash benchmarks/hcx-omni/run_benchmark.sh
+
+# S2S with a real audio file
+python benchmarks/hcx-omni/benchmark_hcx_omni.py \
+    --mode s2s --num-prompts 20 --audio-file /path/to/speech.wav
+
+# Save results to JSON
+python benchmarks/hcx-omni/benchmark_hcx_omni.py \
+    --mode all --num-prompts 10 --output-json results.json
+```
+
+## Metrics
+
+```
+t2v Results:
+  mode                : t2v
+  total               : 10
+  success             : 10
+  success_rate        : 100.0%
+  latency_mean        : 18.43s
+  latency_p50         : 17.91s
+  latency_p90         : 21.34s
+  latency_p99         : 22.10s
+  latency_min         : 15.20s
+  latency_max         : 22.10s
+```
+
+Expected latency ranges (A100 80GB × 6):
+
+| Mode | p50 latency | Notes |
+|------|------------|-------|
+| T2T  | ~2–4 s    | Thinker only |
+| T2V  | ~15–25 s  | Thinker + 50-step diffusion |
+| S2S  | ~5–12 s   | Thinker + BigVGAN vocoder |