update environment configuration, enhance setup guide, and align documentation with new domain structure

infrastructure/nginx/Dockerfile

@@ -3,7 +3,7 @@ FROM nginx:alpine
 COPY nginx.conf /etc/nginx/nginx.conf
 
 # Create directories for HLS and frontend
-RUN mkdir -p /usr/share/nginx/html/hls /usr/share/nginx/html/admin
+RUN mkdir -p /srv/frontend /srv/hls /srv/frontend/admin
 
 EXPOSE 80
 CMD ["nginx", "-g", "daemon off;"]