cluster: nginx vhost for s.f0xx.org on cast01; drop artc0 comment

Co-authored-by: Cursor <cursoragent@cursor.com>

sim/cluster0/nginx/apps-port80.conf

@@ -1,5 +1,5 @@
 # Full androidcast vhost for Alpine BE — listen 80 only.
-# FE (apps.f0xx.org) proxies here: proxy_pass http://artc0.intra.raptor.org:80;
+# FE (apps.f0xx.org / s.f0xx.org) proxies here: cast01–03 cluster :80
 # Port 8089 is a different service (e.g. Janus) — not this vhost.
 
 server {

sim/cluster0/nginx/url-shortener-port80.conf

@@ -0,0 +1,25 @@
+# BE cluster — url-shortener vhost (Host: s.f0xx.org from FE)
+# Install: include from /etc/nginx/http.d/androidcast.conf or http.d/url-shortener.conf
+# Docroot: URL_SHORTENER_ROOT/public (default /var/www/url-shortener/public)
+
+server {
+	listen 80;
+	server_name s.f0xx.org;
+
+	root /var/www/url-shortener/public;
+	index index.php;
+
+	location ^~ /api/ {
+		try_files $uri /index.php?$query_string;
+	}
+
+	location ~ "^/[a-f0-9]{6,16}$" {
+		try_files $uri /index.php?$query_string;
+	}
+
+	location ~ \.php$ {
+		include fastcgi_params;
+		fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
+		fastcgi_pass 127.0.0.1:9000;
+	}
+}