Fix deploy.sh: auto-update nginx config on deploy (STI-93)

deploy.sh was only updating Docker containers but never copying the
nginx config to the host. This meant changes like the sub_filter fix
for GrampsWeb's <base href> rewrite were never applied.

Now diffs deploy-production/nginx.conf against /etc/nginx/sites-enabled/stiftung
and reloads nginx when changed.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

deploy.sh

@@ -135,6 +135,23 @@ echo ""
 echo "--- Collecting static files ---"
 docker compose -f "$COMPOSE_FILE" exec -T web python manage.py collectstatic --noinput
 
+echo ""
+echo "--- Updating nginx config ---"
+NGINX_CONF="$PROD_DIR/deploy-production/nginx.conf"
+NGINX_DEST="/etc/nginx/sites-enabled/stiftung"
+if [[ -f "$NGINX_CONF" ]]; then
+    if ! diff -q "$NGINX_CONF" "$NGINX_DEST" &>/dev/null; then
+        echo "Nginx config changed — updating and reloading"
+        sudo cp "$NGINX_CONF" "$NGINX_DEST"
+        sudo nginx -t && sudo systemctl reload nginx
+        echo "Nginx reloaded"
+    else
+        echo "Nginx config unchanged — skipping"
+    fi
+else
+    echo "WARNUNG: $NGINX_CONF nicht gefunden — nginx nicht aktualisiert"
+fi
+
 echo ""
 echo "--- Service status ---"
 docker compose -f "$COMPOSE_FILE" ps