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/hooks/normal/9000-bee-setup.hook.chroot

@@ -46,6 +46,12 @@ chmod +x /usr/local/bin/bee-log-run    2>/dev/null || true
 # Reload udev rules
 udevadm control --reload-rules 2>/dev/null || true
 
+# rocm-smi symlink (package installs to /opt/rocm-*/bin/rocm-smi)
+if [ ! -e /usr/local/bin/rocm-smi ]; then
+    smi_path="$(find /opt -path '*/bin/rocm-smi' -type f 2>/dev/null | sort | tail -1)"
+    [ -n "${smi_path}" ] && ln -sf "${smi_path}" /usr/local/bin/rocm-smi
+fi
+
 # Create export directory
 mkdir -p /appdata/bee/export