fix(CRITICAL): add --limit-mm-per-prompt image=5 — multimodal request kills engine

Engine crash: ValueError: You set image=0 (or defaulted to 1) in
--limit-mm-per-prompt, but found 1 items in the same prompt.

This kills the entire vLLM engine (AsyncEngineDeadError), making all
subsequent requests return 503. Competition sends image requests in
functional tests (d08/d09 multimodal).

Fix: --limit-mm-per-prompt image=5 allows up to 5 images per prompt.

computility-run.yaml

@@ -33,7 +33,7 @@ command:
     - --dtype
     - half
     - --limit-mm-per-prompt
-    - image=1
+    - image=5
 env:
     - name: VLLM_ENGINE_ITERATION_TIMEOUT_S
       value: '3600'