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

docker-compose.utils.yml

@@ -240,6 +240,31 @@ services:
     volumes:
       - ./linkwarden/meili_data:/meili_data
 
+  ntfy:
+    image: binwiederhier/ntfy
+    container_name: ntfy
+    restart: unless-stopped
+    networks:
+      - web_net
+    ports:
+      - "8086:8086"
+    volumes:
+      - ./ntfy:/etc/ntfy
+      - ntfy_cache:/var/cache/ntfy
+      - ntfy_auth:/var/lib/ntfy
+    command: serve
+    logging: *default-logging
+
+  mailrise:
+    image: yoryan/mailrise
+    container_name: mailrise
+    restart: unless-stopped
+    ports:
+      - "8025:8025"
+    volumes:
+      - ./ntfy/mailrise.yml:/etc/mailrise/mailrise.yml:ro
+    logging: *default-logging
+
 networks:
   web_net:
     name: web_net
@@ -250,3 +275,7 @@ networks:
   internal_net:
     name: internal_net
     external: true
+
+volumes:
+  ntfy_cache:
+  ntfy_auth: