Add automatic fallback for f3s hosts when cluster is down

Configure OpenBSD relayd and httpd to serve a friendly fallback page
when the f3s Kubernetes cluster is unreachable.

Changes to relayd.conf.tpl:
- Reorder relay forward statements: f3s first, localhost as backup
- Remove protocol-level forward rules for f3s hosts to enable relay-level failover
- Add explicit localhost routing for non-f3s hosts
- Health checks on f3s table trigger automatic failover to localhost

Changes to httpd.conf.tpl:
- Add request rewrite directive to serve fallback page for ALL paths
- Prevents 404 errors for deep links like /login?redirect=/files/
- Ensures consistent fallback experience regardless of requested URL

When all f3s nodes fail health checks, traffic automatically routes to
localhost:8080 serving static fallback content from /var/www/htdocs/f3s_fallback.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

0 files changed, 0 insertions, 0 deletions