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, 19 insertions, 0 deletions

diff --git a/dotfiles/common/.zsh/modules/Src/signames1.awk b/dotfiles/common/.zsh/modules/Src/signames1.awk
new file mode 100644
index 0000000..27d21ac
--- /dev/null
+++ b/dotfiles/common/.zsh/modules/Src/signames1.awk
@@ -0,0 +1,19 @@
+# This is an awk script which finds out what the possibilities for
+# the signal names are, and dumps them out so that cpp can turn them
+# into numbers.  Since we don't need to decide here what the
+# real signals are, we can afford to be generous about definitions,
+# in case the definitions are in terms of other definitions.
+# However, we need to avoid definitions with parentheses, which will
+# mess up the syntax.
+BEGIN { printf "#include <signal.h>\n\n" }
+
+/^[\t ]*#[\t ]*define[\t _]*SIG[A-Z][A-Z0-9]*[\t ][\t ]*[^(\t ]/ { 
+    sigindex = index($0, "SIG")
+    sigtail = substr($0, sigindex, 80)
+    split(sigtail, tmp)
+    signam = substr(tmp[1], 4, 20)
+    if (substr($0, sigindex-1, 1) == "_")
+        printf("XXNAMES XXSIG%s _SIG%s\n", signam, signam)
+    else
+        printf("XXNAMES XXSIG%s SIG%s\n", signam, signam)
+}