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>

roles/docker/tasks/monitoring/gotify.yml

@@ -0,0 +1,19 @@
+- name: Create gotify directories
+  ansible.builtin.file:
+    path: "{{ item }}"
+    state: directory
+  loop:
+    - /opt/stacks/gotify
+
+- name: Template out the gotify compose file
+  ansible.builtin.template:
+    src: gotify-compose.yml.j2
+    dest: /opt/stacks/gotify/compose.yml
+    owner: root
+    mode: 644
+
+- name: Deploy gotify stack
+  community.docker.docker_compose_v2:
+    project_src: /opt/stacks/gotify
+    files:
+      - compose.yml