feat: implement comprehensive variable management system

- Create standardized group_vars directory structure
- Add domains.yml with centralized subdomain mappings
- Add infrastructure.yml with network, SMTP, and path config
- Reorganize vault.yml secrets by service with consistent naming
- Update 15+ Docker compose templates to use new variable structure
- Simplify playbook commands by removing --extra-vars requirement
- Replace hardcoded domains/IPs with template variables
- Standardize secret references across all services

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

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

roles/docker/templates/changedetection-compose.yml.j2

@@ -5,11 +5,11 @@ services:
       container_name: changedetection
       hostname: changedetection
       extra_hosts:
-        - 'chat.thesatelliteoflove.com:172.20.0.5'
+        - '{{ subdomains.chat }}:172.20.0.5'
       labels:
         glance.name: Changedetection
         glance.icon: si:watchtower
-        glance.url: https://watcher.thesatelliteoflove.com/
+        glance.url: https://{{ subdomains.watcher }}/
         glance.description: Changedetection
         glance.id: changedetection
       volumes:
@@ -50,7 +50,7 @@ services:
   #      - NO_PROXY="localhost,192.168.0.0/24"
   #
   #        Base URL of your changedetection.io install (Added to the notification alert)
-        - BASE_URL=https://watcher.thesatelliteoflove.com
+        - BASE_URL=https://{{ subdomains.watcher }}
   #        Respect proxy_pass type settings, `proxy_set_header Host "localhost";` and `proxy_set_header X-Forwarded-Prefix /app;`
   #        More here https://github.com/dgtlmoon/changedetection.io/wiki/Running-changedetection.io-behind-a-reverse-proxy-sub-directory
   #      - USE_X_SETTINGS=1
@@ -130,4 +130,4 @@ volumes:
 networks:
   default:
     external: true
-    name: lava
+    name: {{ docker.network_name }}