refactor(iso): replace chroot hooks for DCGM/ROCm with live-build apt sources

Move datacenter-gpu-manager and rocm-smi-lib from dynamic chroot hooks
into live-build's config/archives mechanism so lb caches the .deb files
in cache/packages.chroot/ between builds, eliminating repeated 900+ MB
downloads. Versions pinned via VERSIONS and substituted into package
lists at build time.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

iso/builder/config/package-lists/bee.list.chroot

@@ -70,5 +70,11 @@ firmware-bnx2x
 firmware-cavium
 firmware-qlogic
 
+# NVIDIA DCGM (Data Center GPU Manager) — dcgmi diag for acceptance testing
+datacenter-gpu-manager=1:%%DCGM_VERSION%%
+
+# AMD ROCm SMI — GPU monitoring for Instinct cards (repo: rocm/apt/6.3.4 jammy)
+rocm-smi-lib=%%ROCM_SMI_VERSION%%
+
 # glibc compat helpers (for any external binaries that need it)
 libc6