make it work in docker again and fix some ngx config issues

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.13-slim
+FROM python:3.11-slim
 
 RUN apt-get update && apt-get install -y \
     nginx \
@@ -9,7 +9,7 @@ RUN apt-get update && apt-get install -y \
     imagemagick \
     && rm -rf /var/lib/apt/lists/*
 
-RUN python -m venv /opt/venv
+RUN python -m venv --system-site-packages /opt/venv
 ENV PATH="/opt/venv/bin:$PATH"
 
 WORKDIR /app