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}

initramfs/etc/profile.d/README

@@ -0,0 +1,6 @@
+This directory should contain shell scripts configuring system-wide
+environment on users' shells.
+
+Files with the .sh extension found in this directory are evaluated by
+Bourne-compatible shells (like ash, bash or zsh) when started as a
+login shell.

initramfs/etc/profile.d/color_prompt.sh.disabled

@@ -0,0 +1,17 @@
+# Setup a red prompt for root and a green one for users.
+# Symlink this file to color_prompt.sh to actually enable it.
+
+_normal=$'\e[0m'
+if [ "$USER" = root ]; then
+	_color=$'\e[1;31m'
+	_symbol='#'
+else
+	_color=$'\e[1;32m'
+	_symbol='$'
+fi
+if [ -n "$ZSH_VERSION" ]; then
+	PS1="%{$_color%}%m [%{$_normal%}%~%{$_color%}]$_symbol %{$_normal%}"
+else
+	PS1="\[$_color\]\h [\[$_normal\]\w\[$_color\]]$_symbol \[$_normal\]"
+fi
+unset _normal _color _symbol