chore: switch small-models proxy from Python to Rust (vllm-proxy-rs)

Replace nearaidev/vllm-proxy with nearaidev/vllm-proxy-rs for all
proxy services in small-models.yaml, matching the GLM-5 setup.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Evrard-Nil

small-models.yaml

@@ -31,7 +31,7 @@ x-vllm-common: &vllm-common
   logging: *logging-conf
 
 x-vllm-proxy-common: &vllm-proxy-common
-  image: nearaidev/vllm-proxy@sha256:0b1c4d010cd189c694650cce8f437734e2005ea65955797561d36710210eb4c2
+  image: nearaidev/vllm-proxy-rs@sha256:cfb87b50c3435a3863c21ff89b9ede2d2c77c431fd568f5a22ae274866f67e57
   user: root
   privileged: true
   <<: *nvidia