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>

4 files changed, 8 insertions, 0 deletions

diff --git a/dotfiles/common/.stardict/dic/dictd_www.dict.org_web1913.dict.dz b/dotfiles/common/.stardict/dic/dictd_www.dict.org_web1913.dict.dz
new file mode 100644
index 0000000..b234473
--- /dev/null
+++ b/dotfiles/common/.stardict/dic/dictd_www.dict.org_web1913.dict.dz
diff --git a/dotfiles/common/.stardict/dic/dictd_www.dict.org_web1913.idx b/dotfiles/common/.stardict/dic/dictd_www.dict.org_web1913.idx
new file mode 100644
index 0000000..bc5ce32
--- /dev/null
+++ b/dotfiles/common/.stardict/dic/dictd_www.dict.org_web1913.idx
diff --git a/dotfiles/common/.stardict/dic/dictd_www.dict.org_web1913.idx.oft b/dotfiles/common/.stardict/dic/dictd_www.dict.org_web1913.idx.oft
new file mode 100644
index 0000000..2db9b2b
--- /dev/null
+++ b/dotfiles/common/.stardict/dic/dictd_www.dict.org_web1913.idx.oft
diff --git a/dotfiles/common/.stardict/dic/dictd_www.dict.org_web1913.ifo b/dotfiles/common/.stardict/dic/dictd_www.dict.org_web1913.ifo
new file mode 100644
index 0000000..69d64df
--- /dev/null
+++ b/dotfiles/common/.stardict/dic/dictd_www.dict.org_web1913.ifo
@@ -0,0 +1,8 @@
+StarDict's dict ifo file
+version=2.4.2
+wordcount=160161
+idxfilesize=3024035
+bookname=Webster's Revised Unabridged Dictionary (1913)
+description=Made by Hu Zheng
+date=2007.8.28
+sametypesequence=m