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, 74 deletions

diff --git a/dotfiles/system/.zsh/modules/Test/V09datetime.ztst b/dotfiles/system/.zsh/modules/Test/V09datetime.ztst
deleted file mode 100644
index 7905155..0000000
--- a/dotfiles/system/.zsh/modules/Test/V09datetime.ztst
+++ /dev/null
@@ -1,74 +0,0 @@
-%prep
-
-  if zmodload zsh/datetime 2>/dev/null; then
-    setopt multibyte
-    unset LC_ALL
-    LC_TIME=C
-    TZ=UTC+0
-    # It's not clear this skip_extensions is correct, but the
-    # format in question is causing problems on Solaris.
-    # We'll revist this after the release.
-    [[ "$(strftime %^_10B 0)" = "   JANUARY" ]] || skip_extensions=1
-    [[ "$(LC_TIME=ja_JP.UTF-8 strftime %OS 1)" = 一 ]] || skip_japanese=1
-  else
-    ZTST_unimplemented="can't load the zsh/datetime module for testing"
-  fi
-
-%test
-
-  strftime %y 0
-  strftime %Y 1000000000
-  strftime %x 1200000000
-  strftime %X 1200000001
-0:basic format specifiers
->70
->2001
->01/10/08
->21:20:01
-
-  strftime %-m_%f_%K_%L 1181100000
-  strftime %6. 0
-0:zsh extensions
->6_6_3_3
->000000
-
-  if [[ $skip_extensions = 1 ]]; then
-    ZTST_skip="strftime extensions not supported"
-  elif [[ $skip_japanese = 1 ]]; then
-    ZTST_skip="Japanese UTF-8 locale not supported"
-  else
-    (
-    LC_TIME=ja_JP.UTF-8
-    strftime %Ey 1000000000
-    strftime %Oy 1000000000
-    strftime %Ex 1000000000
-    strftime %OS 1000000000
-    strftime %03Ey 650000000
-    )
-  fi
-0:alternate format extensions
->13
->一
->平成13年09月09日
->四十
->002
-
-  if [[ $skip_extensions = 1 ]]; then
-    ZTST_skip="strftime extensions not supported"
-  else
-    (
-      strftime '%#A' 0
-      strftime '%^_10B' 0
-      strftime %03Ey 650000000
-      strftime %-Oe 0
-    )
-  fi
-0:various extensions
->THURSDAY
->   JANUARY
->090
->1
-
-  print -r -- ${(V)"$(strftime $'%Y\0%m\0%d' 100000000)"}
-0:Embedded nulls
->1973^@03^@03