feat(releng): add gameboot packages for windows gaming deployment

Add packages required for offline Windows gaming dual-boot deployment with Secure Boot support:
- wimlib: for applying Windows install.wim/.esd images
- hivex: for offline BCD and anti-BitLocker modifications
- sbctl/sbsigntools/mokutil: for Secure Boot management
- binutils: for objdump (.sbat) inspection

Note: nvidia driver is conditional and managed separately via fws-setup-hardware.

configs/releng/packages.x86_64

@@ -121,3 +121,15 @@ ostree
 xterm
 # Gestionnaire D&D 5e (dés, personnages, grimoire, sessions, combat).
 fws-dnd
+
+# --- Gameboot : dual-boot Windows gaming (déploiement offline + Secure Boot) ---
+# Outils universels de fws-windows-deploy (%post, hors ligne) + fws-secureboot-setup.
+# NB : PAS de 'nvidia' ici (conditionnel via fws-setup-hardware).
+#   wimlib = apply install.wim/.esd ; hivex = BCD + anti-BitLocker offline ;
+#   sbctl/sbsigntools/mokutil = Secure Boot ; binutils = objdump (.sbat).
+wimlib
+hivex
+sbctl
+sbsigntools
+mokutil
+binutils