Gatus: Add Roundcube, Collabora, and all s0 services (Jellyfin,
servarr stack, Home Assistant, ESPHome, Zigbee2MQTT, Frigate,
Valetudo, Sandman, Vikunja, Actual Budget, Linkwarden, Memos,
Outline, LanguageTool, Unifi) in a new "s0" group.
Dashy: Add missing public services (ntfy, Librechat, Owncast,
Navidrome, Collabora, Gatus) to Services section. Add new Home
Automation and Productivity sections. Add Unifi to Network.
Remove disabled Jitsi Meet.
Gatus is configured entirely via YAML (mapped from Nix attrsets),
making nix-config the single source of truth for all monitoring
config instead of Uptime Kuma's web UI/SQLite database.
