gemma-4-31B-it: --disable-fast-image-processor to stop engine crash on bad media

sglang gemma4 crashes the whole engine (unhandled RuntimeError in
tokenizer_manager._tokenize_one_request -> gemma4 mm processor ->
base_processor.fast_load_mm_data) when a client sends malformed
multimodal input (base64 video data-URL or broken image URL as an
image). Engine crash-loops under live traffic. Trying the non-fast
image-load path to make these fail per-request instead of crashing.

Author: Evrard-Nil

small-models.yaml

@@ -519,6 +519,7 @@ services:
         --chunked-prefill-size 8192
         --num-continuous-decode-steps 5
         --enable-mixed-chunk
+        --disable-fast-image-processor
         --model-loader-extra-config '{"enable_multithread_load": "true", "num_threads": 64}'
         --port 8000
         --host 0.0.0.0