Disable caching in SIT Nginx config (#631)

example/sit/nginx/nginx.conf

@@ -9,6 +9,16 @@ http {
     default_type  application/octet-stream;
     lua_package_path "/usr/local/openresty/lualib/?.lua;;";
 
+    # 通用头：全局禁止缓存
+    # ================================
+    add_header Cache-Control "no-store, no-cache, must-revalidate" always;
+    add_header Pragma "no-cache" always;
+    add_header Expires "0" always;
+
+    # 禁用 Nginx 自身缓存
+    proxy_no_cache 1;
+    proxy_cache_bypass 1;
+
     upstream next_dashboard {
         server 127.0.0.1:3001;
         keepalive 16;