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, 56 deletions

diff --git a/dotfiles/system/.config/picom.conf b/dotfiles/system/.config/picom.conf
deleted file mode 100644
index 0b65df7..0000000
--- a/dotfiles/system/.config/picom.conf
+++ /dev/null
@@ -1,56 +0,0 @@
-# opacity-rule = [
-#     "85:class_g = 'XTerm'",
-#     "85:class_g = 'Alacritty'",
-#     "85:class_g = 'xterm-kitty'",
-#     "85:class_g = 'URxvt'",
-#     "85:class_g = 'tabbed'",
-# ];
-#    "85:class_g = 'st-256color'",
-#    "85:class_g = 'Emacs'",
-
-# Blur
-blur:
-{
-  method = "dual_kawase";
-  strength = 2;
-}
-
-wintypes:
-{
-  normal = { blur-background = true; };
-  splash = { blur-background = false; };
-};
-
-# Fading
-fading = false;
-fade-in-step = 0.07;
-fade-out-step = 0.07;
-fade-exclude = [ ];
-
-# Other
-corner-radius = 10.0;
-round-borders = 1;
-mark-wmwin-focused = true;
-mark-ovredir-focused = true;
-detect-rounded-corners = true;
-rounded-corners-exclude = [
-                        "class_g = 'dwm'",
-                        "class_g = 'dwmsystray'",
-                        "window_type = 'dock'"
-                        ];
-detect-client-opacity = true;
-
-vsync = true;
-dbe = false;
-unredir-if-possible = true;
-detect-transient = true;
-detect-client-leader = true;
-invert-color-include = [ ];
-
-# GLX backend
-backend = "glx";
-glx-no-stencil = true;
-glx-copy-from-front = false;
-use-damage = true
-glx-no-rebind-pixmap = true;
-