feat(nowchess): add TOURNAMENT_EXTERNAL_SERVERS env var to tournament rollout

htwg-1-prod seeds 141.37.123.132:8086 (primary bridge server) on startup
so the registry is populated without manual API calls after pod restarts.

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

nowchess/base/nowchess-rollouts.yaml

@@ -893,6 +893,8 @@ spec:
                   key: ACCOUNT_DB_URL
             - name: TOURNAMENT_SELF_URL
               value: ""
+            - name: TOURNAMENT_EXTERNAL_SERVERS
+              value: ""
             - name: MP_JWT_VERIFY_PUBLICKEY_LOCATION
               value: /secrets/jwt/public.pem
           volumeMounts: