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, 12 insertions, 0 deletions

diff --git a/dotfiles/common/.local/share/applications/org-protocol.desktop b/dotfiles/common/.local/share/applications/org-protocol.desktop
new file mode 100644
index 0000000..1cebf61
--- /dev/null
+++ b/dotfiles/common/.local/share/applications/org-protocol.desktop
@@ -0,0 +1,12 @@
+[Desktop Entry]
+Name=org-protocol
+Comment=Intercept calls from emacsclient to trigger custom actions
+Categories=Other;
+Keywords=org-protocol;
+Icon=emacs
+Type=Application
+Exec=emacsclient -- %u
+Terminal=false
+NoDisplay=true
+StartupWMClass=Emacs
+MimeType=x-scheme-handler/org-protocol;