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, 24 insertions, 0 deletions

diff --git a/dotfiles/common/.config/calibre/device_drivers_USER_DEFINED.py.json b/dotfiles/common/.config/calibre/device_drivers_USER_DEFINED.py.json
new file mode 100644
index 0000000..7963676
--- /dev/null
+++ b/dotfiles/common/.config/calibre/device_drivers_USER_DEFINED.py.json
@@ -0,0 +1,24 @@
+{
+  "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