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, 13 deletions

diff --git a/dotfiles/system/.config/calibre/viewer.json b/dotfiles/system/.config/calibre/viewer.json
deleted file mode 100644
index ecc631e..0000000
--- a/dotfiles/system/.config/calibre/viewer.json
+++ /dev/null
@@ -1,13 +0,0 @@
-{
-  "print-to-pdf-bottom-margin": 1.0,
-  "print-to-pdf-geometry": {
-    "__class__": "bytearray",
-    "__value__": "AdnQywADAAAAAAEjAAAA7AAAAyQAAAIpAAABJQAAAO4AAAMiAAACJwAAAAAAAAAABVYAAAElAAAA7gAAAyIAAAIn"
-  },
-  "print-to-pdf-left-margin": 1.0,
-  "print-to-pdf-page-numbers": false,
-  "print-to-pdf-page-size": "letter",
-  "print-to-pdf-right-margin": 1.0,
-  "print-to-pdf-show-file": true,
-  "print-to-pdf-top-margin": 1.0
-}
\ No newline at end of file