Wire admin studio SSR and search infrastructure

deploy/nginx/sitemaps.conf

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+# ---------------------------------------------------------------------------
+# Nginx static sitemap file serving
+# ---------------------------------------------------------------------------
+# Include this snippet inside your `server {}` block BEFORE the main
+# `location /` (or `location ~ \.php$`) block so nginx serves the pre-built
+# static XML files without ever touching PHP/FPM.
+#
+# The GenerateSitemapsCommand writes these files on a schedule (every 6 h):
+#   public/sitemap.xml            <- root sitemap index
+#   public/sitemaps/{name}.xml    <- per-family / per-shard documents
+#
+# When a file has not been generated yet (first deploy, cold start) the
+# request falls through to @php and Laravel's SitemapController builds it
+# live on the first hit.
+# ---------------------------------------------------------------------------
+
+# Root sitemap index
+location = /sitemap.xml {
+    # Serve the static file if it exists; otherwise fall through to PHP.
+    try_files $uri @php;
+
+    # Instruct downstream caches / crawlers how long the file is fresh.
+    add_header Cache-Control "public, max-age=21600" always;  # 6 h
+    add_header Content-Type  "application/xml; charset=UTF-8" always;
+
+    # Optional: let nginx set a strong ETag automatically (default behaviour).
+    etag on;
+}
+
+# Per-family / per-shard sitemap documents
+location ~ ^/sitemaps/[A-Za-z0-9_\-]++\.xml$ {
+    try_files $uri @php;
+
+    add_header Cache-Control "public, max-age=21600" always;  # 6 h
+    add_header Content-Type  "application/xml; charset=UTF-8" always;
+
+    etag on;
+}