refactor: update Docker configuration & docs

- Modified docker-compose.yml to clarify that the server runs as a non-root user.
- Updated Dockerfile to use ARG for VITE_SERVER_URL, allowing build-time overrides.
- Replaced inline Nginx configuration with a separate nginx.conf file for better maintainability.
- Adjusted documentation to reflect changes in Docker setup and troubleshooting steps.

docker-compose.yml

@@ -59,11 +59,12 @@ services:
       # If you need to work on a project, create it INSIDE the container
       # or use a separate docker-compose override file
 
-    # Security: Run as non-root user (already set in Dockerfile)
+    # Security: Server runs as non-root user (already set in Dockerfile)
     # Security: No privileged mode
     # Security: No host network access
     # Security: No host filesystem mounts
 
 volumes:
   automaker-data:
+    name: automaker-data
     # Named volume - completely isolated from host filesystem