Add HPC tuning: PCIe ASPM off, C-states, performance CPU governor

- grub.cfg + isolinux/live.cfg.in: add pcie_aspm=off,
  intel_idle.max_cstate=1 and processor.max_cstate=1 to all
  non-failsafe boot entries
- bee-hpc-tuning: new script that sets all CPU cores to performance
  governor via sysfs and logs THP state at boot
- bee-hpc-tuning.service: runs before bee-nvidia and bee-audit
- 9000-bee-setup.hook.chroot: enable service and mark script executable

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

iso/builder/config/hooks/normal/9000-bee-setup.hook.chroot

@@ -25,6 +25,7 @@ ensure_bee_console_user() {
 ensure_bee_console_user
 
 # Enable common bee services
+systemctl enable bee-hpc-tuning.service
 systemctl enable bee-network.service
 systemctl enable bee-preflight.service
 systemctl enable bee-audit.service
@@ -55,6 +56,7 @@ fi
 # nogpu: no GPU services needed
 
 # Ensure scripts are executable
+chmod +x /usr/local/bin/bee-hpc-tuning  2>/dev/null || true
 chmod +x /usr/local/bin/bee-network.sh  2>/dev/null || true
 chmod +x /usr/local/bin/bee-sshsetup   2>/dev/null || true
 chmod +x /usr/local/bin/bee-smoketest  2>/dev/null || true