refactor(stack.yml): 移除SEARXNG_BASE_URL并更新卷路径

移除不再需要的SEARXNG_BASE_URL环境变量，并将本地路径改为使用变量${Volumes_PATH}以增加配置灵活性

searxng/stack.yml

@@ -21,7 +21,6 @@ services:
     depends_on:
       - valkey
     environment:
-      - SEARXNG_BASE_URL=https://${SEARXNG_HOSTNAME:-localhost}/
       - UWSGI_WORKERS=${SEARXNG_UWSGI_WORKERS:-4}
       - UWSGI_THREADS=${SEARXNG_UWSGI_THREADS:-4}
     ports:
@@ -29,7 +28,7 @@ services:
     networks:
       - searxng
     volumes:
-      - ./searxng:/etc/searxng:rw
+      - ${Volumes_PATH}/etc-searxng:/etc/searxng:rw
       - ${Volumes_PATH}/searxng-data:/var/cache/searxng:rw
 
 networks: