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>

2 files changed, 28 insertions, 0 deletions

diff --git a/dotfiles/common/.gnupg/gpg-agent.conf b/dotfiles/common/.gnupg/gpg-agent.conf
new file mode 100644
index 0000000..6448665
--- /dev/null
+++ b/dotfiles/common/.gnupg/gpg-agent.conf
@@ -0,0 +1,18 @@
+# Pinentry configuration
+pinentry-program /usr/bin/pinentry-dmenu
+pinentry-timeout 10
+allow-loopback-pinentry
+
+# Cache passphrases for entire login session (400 days)
+default-cache-ttl 34560000
+max-cache-ttl 34560000
+
+# Enable SSH support (use gpg-agent for SSH keys too)
+enable-ssh-support
+
+# Prevent external programs from clearing cache
+no-allow-external-cache
+
+# Keep running even when no connections
+keep-display
+keep-tty
diff --git a/dotfiles/common/.gnupg/pinentry-dmenu.conf b/dotfiles/common/.gnupg/pinentry-dmenu.conf
new file mode 100644
index 0000000..ccd4d55
--- /dev/null
+++ b/dotfiles/common/.gnupg/pinentry-dmenu.conf
@@ -0,0 +1,10 @@
+asterisk= "* ";
+prompt = "$";
+font = "BerkeleyMono Nerd Font:size=12";
+prompt_fg = "#eeeeee";
+prompt_bg = "#d9904a";
+normal_fg = "#ffffff";
+normal_bg = "#000000";
+select_fg = "#eeeeee";
+select_bg = "#d9904a";
+desc_fg = "#eeeeee";