feat: Add firmware installation and module dependency resolution

- Add Alpine firmware package installation support
- Implement recursive module dependency resolution using modinfo
- Add config/firmware.conf for NIC firmware selection
- Enhanced initramfs_setup_modules with dependency tracking
- Firmware installation integrated into main build process

Features:
- Automatic dependency resolution for kernel modules
- Alpine's separate firmware APK packages for optimal size
- Stage1/Stage2 module loading with complete dependencies
- No duplicate modules between stages

config/firmware.conf

@@ -0,0 +1,23 @@
+# Firmware configuration for Zero OS Alpine Initramfs
+# Alpine Linux provides separate firmware packages for hardware support
+# Format: FIRMWARE_PACKAGE:DESCRIPTION
+
+# Essential network firmware packages
+linux-firmware-bnx2:Broadcom NetXtreme firmware
+linux-firmware-e100:Intel PRO/100 firmware
+linux-firmware-intel:Intel network and WiFi firmware (includes e1000e, igb, ixgbe, i40e, ice)
+linux-firmware-realtek:Realtek network firmware (r8169, etc.)
+linux-firmware-mellanox:Mellanox network firmware
+linux-firmware-qlogic:QLogic network firmware
+
+# Storage firmware (if needed)
+linux-firmware-marvell:Marvell storage/network firmware
+
+# Optional firmware packages (uncomment if needed)
+#linux-firmware-amd:AMD GPU and network firmware
+#linux-firmware-nvidia:NVIDIA GPU firmware
+#linux-firmware-atheros:Atheros wireless firmware
+#linux-firmware-broadcom:Broadcom wireless firmware
+
+# Minimal firmware selection for embedded/container environments
+# For full hardware support, uncomment additional packages above