test: add 30s delay before nginx to verify HF SSE during STARTING

ubuntu-server/start-server.sh

@@ -111,8 +111,9 @@ log "[ubuntu] ══ System ready ══"
 done) &
 
 # ── Start nginx LAST → opens port 7860 → HF transitions to RUNNING ──
-# All output above this line is visible in HF's runtime SSE
-# (HF only streams logs during STARTING state, before port 7860 responds)
+# Delay nginx to keep container in STARTING state so SSE captures output
+log "[ubuntu] Delaying nginx by 30s to test HF SSE capture during STARTING..."
+sleep 30
 log "[ubuntu] Starting nginx on 0.0.0.0:7860 (HF will mark RUNNING) ..."
 nginx -g 'daemon off;' &
 NGINX_PID=$!