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/profile.d/20locale.sh

@@ -0,0 +1,3 @@
+export CHARSET=${CHARSET:-UTF-8}
+export LANG=${LANG:-C.UTF-8}
+export LC_COLLATE=${LC_COLLATE:-C}