fix: Remove limiter.toml volume mount to fix SearXNG container crash

Docker was creating /etc/searxng/limiter.toml as a directory instead of
mounting the file, causing IsADirectoryError. The limiter is already
disabled in settings.yml, so the separate toml file is not needed.

docker-compose.yml

@@ -62,7 +62,6 @@ services:
       - SEARXNG_SECRET=priceflow-searxng-secret
     volumes:
       - ./searxng/settings.yml:/etc/searxng/settings.yml:ro
-      - ./searxng/limiter.toml:/etc/searxng/limiter.toml:ro
     networks:
       - nginx_default