fix(deploy): replace PDA H5 containers with static hosting

deploy/nginx.conf.template

@@ -0,0 +1,21 @@
+# Merge into the existing site's server block; preserve TLS and panel includes.
+# Render only PDA_SITE_ROOT and PDA_GATEWAY_ORIGIN (see README).
+# Replace existing root/index and matching locations; do not append duplicates.
+root ${PDA_SITE_ROOT};
+index index.html;
+
+location / {
+    try_files $uri $uri/ =404;
+    add_header Cache-Control "no-store" always;
+}
+
+location ^~ /gateway-api/ {
+    proxy_pass ${PDA_GATEWAY_ORIGIN}/api/;
+    proxy_http_version 1.1;
+    proxy_set_header Host $host;
+    proxy_set_header Authorization $http_authorization;
+    proxy_set_header X-Real-IP $remote_addr;
+    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    proxy_set_header X-Forwarded-Proto $scheme;
+    client_max_body_size 55m;
+}