Refactor llamactl-proxy service ports configuration to use internal port variable

apps/base/llamactl-proxy/service.yaml

@@ -9,6 +9,5 @@ spec:
   type: ExternalName
   externalName: placeholder
   ports:
-  - port: 80
-    targetPort: ${LLAMACTL_INTERNAL_PORT}
+  - port: ${LLAMACTL_INTERNAL_PORT}
     name: http