Nginx is closer to the origin, so compressing there avoids an
extra hop. Removes the Caddy encode block for Nextcloud and adds
gzip in nginx with level 4 targeting text, CSS, JS, JSON, XML, SVG.
Caddy was compressing all responses including binary file downloads
(PDFs, images, videos), which severely throttled download speed to
~130KB/s despite 30MB/s VPS bandwidth. Now only compresses text-based
types (HTML, CSS, JS, JSON, XML, SVG) where compression actually helps.
Caddy was decompressing nginx's gzip responses and sending them
uncompressed to the browser, causing core-common.js (5.7MB) to
take 25s to download. Adding encode zstd gzip compresses it to
1.3MB at the edge.
Replace the all-in-one Apache image with nextcloud:33-fpm and an Nginx
sidecar that serves static assets directly with gzip compression and
cache headers, avoiding the prefork concurrency bottleneck.
