Add compose file management infrastructure
- collect-compose.yml: Fetches all compose files from docker_hosts
- collect-env-templates.yml: Creates .env.example with secrets redacted
- deploy-compose.yml: Pushes compose files to hosts (with optional restart)
- diff-compose.yml: Shows differences before deploying
Collected 23 compose files from 7 hosts:
- replicant: 12 stacks (arr-stack, mealie, portainer, etc)
- docker666: 4 stacks (unifi, gluetun, uptime, utils)
- databases: 3 stacks (postgres, forgejo, utils)
- download-stack: 2 stacks (download-stack, utils)
- media-transcode: 1 stack (utils)
- network-services: 1 stack (utils)
- immich: 1 stack (utils)
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