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, 0 insertions, 17 deletions

diff --git a/dotfiles/system/.local/bin/cron/checkup b/dotfiles/system/.local/bin/cron/checkup
deleted file mode 100755
index bd3c634..0000000
--- a/dotfiles/system/.local/bin/cron/checkup
+++ /dev/null
@@ -1,17 +0,0 @@
-#!/bin/sh
-
-# Syncs repositories and downloads updates, meant to be run as a cronjob.
-
-notify-send "📦 Repository Sync" "Checking for package updates..."
-
-sudo pacman -Syyuw --noconfirm || notify-send "Error downloading updates.
-
-Check your internet connection, if pacman is already running, or run update manually to see errors."
-pkill -RTMIN+8 "${STATUSBAR:-dwmblocks}"
-
-if pacman -Qu | grep -v "\[ignored\]"
-then
-	notify-send "🎁 Repository Sync" "Updates available. Click statusbar icon (📦) for update."
-else
-	notify-send "📦 Repository Sync"  "Sync complete. No new packages for update."
-fi