Add POTE app project support and improve IP conflict detection
- Add roles/pote: Python/venv deployment role with PostgreSQL, cron jobs
- Add playbooks/app/: Proxmox app stack provisioning and configuration
- Add roles/app_setup: Generic app deployment role (Node.js/systemd)
- Add roles/base_os: Base OS hardening role
- Enhance roles/proxmox_vm: Split LXC/KVM tasks, improve error handling
- Add IP uniqueness validation: Preflight check for duplicate IPs within projects
- Add Proxmox-side IP conflict detection: Check existing LXC net0 configs
- Update inventories/production/group_vars/all/main.yml: Add pote project config
- Add vault.example.yml: Template for POTE secrets (git key, DB, SMTP)
- Update .gitignore: Exclude deploy keys, backup files, and other secrets
- Update documentation: README, role docs, execution flow guides
Security:
- All secrets stored in encrypted vault.yml (never committed in plaintext)
- Deploy keys excluded via .gitignore
- IP conflict guardrails prevent accidental duplicate IP assignments
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