Add post-video redirect to YouTube URL from env config.

After the intro finishes, users are redirected to POST_VIDEO_REDIRECT_URL loaded via generated config.js for dev, Docker, and Dokploy deployments.

Co-authored-by: Cursor <cursoragent@cursor.com>

Dockerfile

@@ -11,9 +11,11 @@ COPY index.html /usr/share/nginx/html/index.html
 COPY site.webmanifest /usr/share/nginx/html/site.webmanifest
 COPY assets/ /usr/share/nginx/html/assets/
 
+# Generate config.js from env vars at container start
+COPY generate-config.sh /docker-entrypoint.d/99-generate-config.sh
+RUN chmod +x /docker-entrypoint.d/99-generate-config.sh
+
 EXPOSE 80
 
 HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
     CMD wget -qO- http://localhost:80/ || exit 1
-
-CMD ["nginx", "-g", "daemon off;"]