Add GoAccess metrics dashboard with WebSocket support

- Add GoAccess package to Docker container
- Create GoAccess startup script with real-time HTML generation
- Add metrics.ralsina.me server block with authentication
- Configure WebSocket proxy for live metrics updates
- Add password protection with .htpasswd
- Fix WebSocket URL to use proper HTTPS endpoint
- Update all server blocks to listen on 0.0.0.0:8080 for Fly.io compatibility

Co-Authored-By: z.ai LGM 4.5 <noreply@z.ai>

reverse_proxy/Dockerfile

@@ -14,7 +14,7 @@ COPY . ./
 
 # https://docs.docker.com/develop/develop-images/multistage-build/#use-multi-stage-builds
 FROM alpine:latest
-RUN apk update && apk add --no-cache ca-certificates iptables ip6tables nginx
+RUN apk update && apk add --no-cache ca-certificates iptables ip6tables nginx goaccess
 
 # Copy binary to production image
 COPY --from=builder /app/start.sh /app/start.sh
@@ -23,6 +23,8 @@ COPY --from=tailscale /app/tailscale /app/tailscale
 RUN mkdir -p /var/run/tailscale /var/cache/tailscale /var/lib/tailscale /usr/share/nginx/html
 COPY nginx.conf   /etc/nginx/http.d/nginx.conf
 COPY custom_50x.html /usr/share/nginx/html/
+COPY goaccess.sh /app/goaccess.sh
+COPY .htpasswd /etc/nginx/.htpasswd
 
 # Run on container startup.
 EXPOSE 8080