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, 32 insertions, 0 deletions

diff --git a/dotfiles/common/.config/redshift.conf b/dotfiles/common/.config/redshift.conf
new file mode 100644
index 0000000..92b61bf
--- /dev/null
+++ b/dotfiles/common/.config/redshift.conf
@@ -0,0 +1,32 @@
+[redshift]
+; Color temperature in Kelvin
+; 6500K = neutral daylight (no filter)
+; 5000K = subtle warmth
+; 4500K = noticeable but readable warmth (recommended for night)
+; 4000K = warm (like incandescent bulb)
+; 3500K = very warm/orange (often too much)
+
+temp-day=6500
+temp-night=4500
+
+; Brightness (1.0 = full, 0.8 = 20% dimmed)
+; Keeping at 1.0 avoids readability issues
+brightness-day=1.0
+brightness-night=1.0
+
+; Gamma correction (1.0 = no correction)
+gamma=1.0
+
+; Fade between day/night (1 = gradual, 0 = instant)
+fade=1
+
+; Screen adjustment method
+adjustment-method=randr
+
+; Location for sunrise/sunset calculation
+location-provider=manual
+
+[manual]
+; New Orleans, LA
+lat=29.951065
+lon=-90.071533