This commit updates the documentation and Terraform variables to reflect recent changes in the Proxmox environment setup.
- `docs/proxmox-setup.md`: Added `VM.GuestAgent.Audit` and `VM.GuestAgent.FileRead` to the required privileges list and the CLI command example. This ensures Terraform can properly interact with the QEMU Guest Agent.
- `terraform/prod/variables.tf`: Set a default value ("damien") for the `username` variable in the `virtual_machines` object to simplify configuration for the primary user.
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