fix: Switch to space-separated sources.conf format

- Change from colon to space separation to avoid URL parsing issues
- Update sources.conf format: TYPE NAME URL VERSION BUILD_FUNCTION [EXTRA]
- Implement awk-based parsing for reliable field extraction
- Fix firmware package list (remove unavailable linux-firmware-marvell)

initramfs/etc/apk/world

@@ -0,0 +1,30 @@
+alpine-baselayout
+alpine-keys
+alpine-release
+apk-tools
+bmon
+btrfs-progs
+busybox
+dhcpcd
+dosfstools
+ethtool
+eudev
+eudev-hwids
+eudev-libs
+eudev-netifnames
+haveged
+iproute2
+kmod
+libc-utils
+linux-firmware-bnx2
+linux-firmware-e100
+linux-firmware-intel
+linux-firmware-mellanox
+linux-firmware-qlogic
+linux-firmware-realtek
+musl
+openssh-server
+tcpdump
+util-linux
+zellij
+zlib