refactor(dotfiles): rename system/ to common/ and remove unused configs

Rename dotfiles/system to dotfiles/common for clarity - indicates
shared dotfiles used across all desktop environments (DWM, Hyprland).

Removed config directories for uninstalled applications:
- ghostty (using different terminal)
- lf (using ranger instead)
- mopidy (using mpd instead)
- nitrogen (X11-only, obsolete for Wayland)
- pychess (not installed)
- JetBrains (not installed via archsetup)
- youtube-dl (using yt-dlp with different config location)

Kept audacious config for potential future use.

Updated all references in archsetup, CLAUDE.md, todo.org, and
validation.sh.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/archsetup b/archsetup
index 9e03a8b..faffda2 100755
--- a/archsetup
+++ b/archsetup
@@ -833,7 +833,7 @@ user_customizations() {
     dotfiles_dir="$user_archsetup_dir/dotfiles"
 
     action="linking dotfiles into place" && display "task" "$action"
-    (cd "$dotfiles_dir"  &&  stow --target="/home/$username" --no-folding --adopt system \
+    (cd "$dotfiles_dir"  &&  stow --target="/home/$username" --no-folding --adopt common \
                                 >> "$logfile" 2>&1 )  || error_warn "$action" "$?"
 
     # Stow desktop-environment-specific dotfiles