Fix WhatsApp/OG link previews: https URLs and correct image dimensions

nginx was sending X-Forwarded-Proto: http (its own scheme) rather than
https (the edge scheme), so og:url and og:image were http:// URLs.
Fixed by hardcoding https in the nginx proxy_set_header since HTTPS is
always terminated at the upstream Apache router.

Added a 1200x630 landscape og-default.png (WhatsApp requires ~1.91:1
ratio) and explicit og:image:width/height meta tags. Also tracks the
nginx site config in the repo.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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