fix(deploy): wait for Next.js container readiness before verification

The container can still be booting when Nginx starts proxying, causing a
temporary 502 in the post-deploy verification. Poll localhost:3000 for up
to 60s after recreating the container.

scripts/deploy.sh

@@ -274,7 +274,21 @@ cmd_deploy() {
         if [ -f '$COMPOSE_FILE' ]; then
             $COMPOSE_CMD -f '$COMPOSE_FILE' build
             $COMPOSE_CMD -f '$COMPOSE_FILE' up -d
-            echo \"✅ Next.js 容器已重建\"
+            echo \"✅ Next.js 容器已重建，等待就绪...\"
+            READY=0
+            for i in \$(seq 1 30); do
+                if curl -fsS -o /dev/null --max-time 3 http://127.0.0.1:3000/ 2>/dev/null; then
+                    READY=1
+                    break
+                fi
+                sleep 2
+            done
+            if [ \"\$READY\" = \"1\" ]; then
+                echo \"✅ $NEXTJS_CONTAINER 就绪\"
+            else
+                echo \"❌ $NEXTJS_CONTAINER 未就绪，请检查容器日志\"
+                exit 1
+            fi
         else
             echo \"⚠️  未找到 ${COMPOSE_FILE}，跳过 Next.js 容器重建\"
         fi