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/tasks/productivity/main.yml

@@ -25,9 +25,6 @@
   import_tasks: dawarich.yml
   tags: dawarich
 
-- name: Install pingvin
-  import_tasks: pingvin.yml
-  tags: pingvin
 
 - name: Install obsidian-livesync
   import_tasks: obsidian-livesync.yml