fix: update YAML anchor name to match alias reference

The anchor &qwen35-122b-common was not updated to &sg-qwen35-122b-common
when the YAML key was renamed, causing 'unknown anchor' validation errors.

Author: Lloyd

Qwen3.5-122B.yaml

@@ -27,7 +27,7 @@ x-vllm-proxy-common: &vllm-proxy-common
   restart: unless-stopped
   logging: *logging-conf
 
-x-sg-qwen35-122b-common: &qwen35-122b-common
+x-sg-qwen35-122b-common: &sg-qwen35-122b-common
   <<: *nvidia
   init: true
   # SGLang v0.5.12 (cu129) — migrated off vLLM 2026-05-22.