[FIX] installer: serve the AvianVisitors collage at / on a fresh clone

scripts/install_services.sh

@@ -238,6 +238,13 @@ EOF
   usermod -aG $USER caddy
   usermod -aG video caddy
   chmod g+r+x $HOME
+
+  # Serve the AvianVisitors collage at / rather than the stock BirdNET-Pi UI.
+  # The Caddyfile written above is the stock one (hardcoded php-fpm.sock, no
+  # index.html try_files override); re-apply both through update_caddyfile.sh,
+  # the single source of truth, so / serves index.html not index.php. Run it
+  # last so it wins.
+  "$HOME/BirdNET-Pi/scripts/update_caddyfile.sh"
 }
 
 install_avahi_aliases() {

scripts/update_caddyfile.sh

@@ -84,4 +84,12 @@ EOF
 fi
 
 sudo caddy fmt --overwrite /etc/caddy/Caddyfile
-sudo systemctl reload caddy
+# Fail loudly on a Caddyfile caddy can't parse rather than reloading a broken
+# config and reporting success.
+sudo caddy validate --config /etc/caddy/Caddyfile --adapter caddyfile || {
+  echo "generated Caddyfile failed validation; not reloading caddy" >&2
+  exit 1
+}
+# reload-or-restart so this also works at install time, when caddy may not be
+# running yet (a plain reload would fail there); tolerate a not-yet-ready unit.
+sudo systemctl reload-or-restart caddy 2>/dev/null || true