Create postfix.sh
### Summary
Adds a deploy hook for Postfix mail servers.
### Features
- Exports environment variables:
- DEPLOY_POSTFIX_PEM_PATH (default: /etc/postfix/cert)
- DEPLOY_POSTFIX_PEM_NAME (default: <domain>.pem)
- DEPLOY_POSTFIX_RELOAD (default: "true")
- Atomic PEM write and configurable permissions
- Deterministic precedence (ENV > saved conf > default)
- Compatible with existing acme.sh deploy framework
Tested on Debian 12 with Postfix 3.7.
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