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, 24 deletions

diff --git a/dotfiles/system/.config/calibre/device_drivers_USER_DEFINED.py.json b/dotfiles/system/.config/calibre/device_drivers_USER_DEFINED.py.json
deleted file mode 100644
index 7963676..0000000
--- a/dotfiles/system/.config/calibre/device_drivers_USER_DEFINED.py.json
+++ /dev/null
@@ -1,24 +0,0 @@
-{
-  "extra_customization": [
-    "",
-    "",
-    "",
-    null,
-    "",
-    "",
-    "",
-    "",
-    "",
-    "",
-    false
-  ],
-  "format_map": [
-    "epub",
-    "mobi",
-    "pdf"
-  ],
-  "read_metadata": true,
-  "save_template": "{author_sort}/{title} - {authors}",
-  "use_author_sort": false,
-  "use_subdirs": true
-}
\ No newline at end of file