Add ntfy push notifications + mailrise SMTP bridge

- ntfy: self-hosted push notification service (port 8086)
- mailrise: SMTP-to-ntfy converter (port 8025)
- Configs in ./ntfy/server.yml and ./ntfy/mailrise.yml
- Token-based authentication for ntfy
- Updated docs and .gitignore

RESTORE.md

@@ -64,7 +64,7 @@ mkdir -p /docker/{immich,qBittorrent,paperless,stirling,syncthing,gitea}
 mkdir -p /docker/{speedtest-tracker,rustdesk,redbot,maloja,scrobble}
 mkdir -p /docker/{retrom/config,retrom/data}
 mkdir -p /docker/{wud,ntopng,slskd,npm/data,npm/letsencrypt,npm/mysql}
-mkdir -p /docker/{Homepage/config,neolink,tandoor,linkwarden}
+mkdir -p /docker/{Homepage/config,neolink,tandoor,linkwarden,ntfy}
 
 # Set correct permissions
 PUID=$(id -u)
@@ -84,9 +84,11 @@ docker volume create docker_dbdata
 docker volume create docker_aidata
 docker volume create docker_onlyoffice
 docker volume create docker_redisdata
+docker volume create ntfy_cache
+docker volume create ntfy_auth
 
 # Restore volume data
-for volume in portainer_data open-webui docker_dbdata docker_aidata docker_onlyoffice docker_redisdata; do
+for volume in portainer_data open-webui docker_dbdata docker_aidata docker_onlyoffice docker_redisdata ntfy_cache ntfy_auth; do
   if [ -f "/path/to/backup/volumes/${volume}.tar.gz" ]; then
     docker run --rm \
       -v ${volume}:/volume \