feat: deprecate Pingvin file sharing service

- Remove Pingvin Docker Compose template and deployment tasks
- Remove files.thesatelliteoflove.com routing from Caddyfile
- Remove files subdomain from domain variables
- Stop and remove Pingvin containers from remote server
- Clean up /opt/stacks/pingvin directory

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

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

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

@@ -1,24 +0,0 @@
-services:
-  pingvin-share:
-    image: stonith404/pingvin-share:latest
-    restart: unless-stopped
-    environment:
-      - TRUST_PROXY=true
-    extra_hosts:
-      - '{{ subdomains.auth }}:{{ docker.hairpin_ip }}'
-    labels:
-      glance.name: Pingvin
-      glance.icon: si:files
-      glance.url: https://{{ subdomains.files }}
-      glance.description: File sharing service
-      glance.id: pingvin
-    volumes:
-      - data:/opt/app/backend/data
-      - images:/opt/app/frontend/public/img
-volumes:
-  images:
-  data:
-networks:
-  default:
-    external: true
-    name: {{ docker.network_name }}