fix: run container as root, patch nginx.conf to disable user directive

ai/honcho/Dockerfile

@@ -40,9 +40,21 @@ RUN pnpm --filter @openconcho/web build
 # runtime stage — nginx + Honcho FastAPI
 FROM python:3.13-slim-bookworm
 
+# Install nginx and create runtime dirs before dropping permissions
 RUN apt-get update && apt-get install -y --no-install-recommends nginx && \
     rm -rf /var/log/nginx/* && \
-    rm -rf /var/lib/apt/lists/*
+    rm -rf /var/lib/apt/lists/* && \
+    rm -f /etc/nginx/sites-enabled/default
+
+# Patch nginx.conf: comment out "user www-data;" so nginx master stays as root
+# (workers inherit root inside a container — fine for single-service isolation)
+RUN sed -i 's/^user /# user /' /etc/nginx/nginx.conf
+
+# Pre-create nginx runtime directories with proper ownership
+RUN mkdir -p /var/lib/nginx/body /var/lib/nginx/proxy /var/lib/nginx/fastcgi \
+             /var/lib/nginx/uwsgi /var/lib/nginx/scgi /var/lib/nginx/proxy_temp \
+             /var/cache/nginx && \
+    chown -R root:root /var/lib/nginx /var/cache/nginx
 
 # Honcho
 COPY --from=honcho-builder /app /app
@@ -56,17 +68,7 @@ COPY --from=openconcho-builder /app/packages/web/dist /usr/share/nginx/html
 
 # nginx config (proxies /v3/, /v2/ to Honcho on localhost:8000)
 COPY honcho-nginx.conf /etc/nginx/conf.d/default.conf
-RUN rm -f /etc/nginx/sites-enabled/default
-
-RUN groupadd --system app && \
-    useradd --system --gid app --create-home app && \
-    chown -R app:app /app /usr/share/nginx/html && \
-    # nginx runtime dirs need to exist for non-root master? Actually master is root, just ensure /var/lib/nginx exists
-    mkdir -p /var/lib/nginx/body /var/lib/nginx/proxy /var/lib/nginx/fastcgi /var/lib/nginx/uwsgi /var/lib/nginx/scgi && \
-    chown -R root:root /var/lib/nginx && \
-    chmod 755 /var/lib/nginx
 
 EXPOSE 80
 
-# nginx runs as root (needed for port 80 + runtime dirs), Honcho runs as app user
-CMD ["sh", "-c", "nginx && exec su -s /bin/sh app -c 'fastapi run --host 127.0.0.1 --port 8000 src/main.py'"]
+CMD ["sh", "-c", "nginx -g 'daemon off;' & fastapi run --host 127.0.0.1 --port 8000 src/main.py"]