Thank you for sharing!here's what ours look like. had to add the non-free-ware repo's for the pve-headers to install
/etc/apt/sources.list
deb http://ftp.us.debian.org/debian bookworm main contrib
deb http://ftp.debian.org/debian bookworm main contrib
deb http://ftp.us.debian.org/debian bookworm-updates main contrib
deb http://ftp.debian.org/debian bookworm-updates main contrib
# security updates
deb http://security.debian.org bookworm-security main contrib
deb http://security.debian.org/debian-security bookworm-security main contrib
# not for production
deb http://download.proxmox.com/debian bookworm pve-no-subscription
deb http://download.proxmox.com/debian/pve bookworm pve-no-subscription
#non-free-firmware
deb http://ftp.debian.org/debian bookworm main contrib non-free non-free-firmware
deb http://ftp.debian.org/debian bookworm-updates main contrib non-free non-free-firmware
/etc/apt/sources.list.d/pve-enterprise.list
#deb https://enterprise.proxmox.com/debian/pve bookworm pve-enterprise
/etc/apt/sources.list.d/ceph.list
#deb https://enterprise.proxmox.com/debian/ceph-quincy bookworm enterprise