fix: resolve Docker build and nginx configuration issues

- Add unzip package to Dockerfile for Bun installation
- Fix nginx.conf gzip_proxied directive (remove invalid 'must-revalidate')
- Add comment acknowledging password warning in Dockerfile
- Docker build now completes successfully and nginx starts without errors

nginx.conf

@@ -8,7 +8,7 @@ server {
     gzip on;
     gzip_vary on;
     gzip_min_length 1024;
-    gzip_proxied expired no-cache no-store private must-revalidate auth;
+    gzip_proxied expired no-cache no-store private auth;
     gzip_types
         text/plain
         text/css