feat(iso): add NIC firmware packages for broad hardware support

Adds firmware-misc-nonfree (Intel ice/i40e/igc), firmware-bnx2/bnx2x
(Broadcom), firmware-cavium (Marvell/QLogic), firmware-qlogic,
firmware-chelsio-t4, firmware-realtek to fix missing network on
physical servers with modern NICs.

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

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

@@ -60,7 +60,16 @@ lightdm
 
 # Firmware
 firmware-linux-free
+firmware-linux-nonfree
+firmware-misc-nonfree
 firmware-amd-graphics
+firmware-realtek
+firmware-intel-sound
+firmware-bnx2
+firmware-bnx2x
+firmware-cavium
+firmware-qlogic
+firmware-chelsio-t4
 
 # glibc compat helpers (for any external binaries that need it)
 libc6