feat: add Gotify notification server with iGotify iOS support

Add comprehensive push notification infrastructure with:
- Gotify server for push notifications with admin password configuration
- iGotify Assistant service for iOS notification relay via Apple Push Notifications
- Dual subdomain setup (gotify.* and gotify-assistant.*)
- Proper service dependencies and container communication via hairpinning
- Caddy reverse proxy configuration for both services
- DNS A records for both subdomains
- Added to monitoring services category
- Tested with successful notification delivery

Services accessible at:
- https://gotify.thesatelliteoflove.com (main server)
- https://gotify-assistant.thesatelliteoflove.com (iOS assistant)

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

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

dns.yml

@@ -45,6 +45,10 @@
             ip: "152.53.36.98"
           - name: bookmarks
             ip: "152.53.36.98"
+          - name: gotify
+            ip: "152.53.36.98"
+          - name: gotify-assistant
+            ip: "152.53.36.98"
       - name: nerder.land
         dns_records:
           - name: "forms"