feat: add omarchy theme template system with management scripts

- New default/themed/ templates (alacritty, btop, foot, ghostty, helix,
  hyprland, hyprlock, kitty, mako, obsidian, rofi, swayosd, tmux,
  walker, waybar, keyboard.rgb, gum.env, etc.)
- Add omarchy-* theme management scripts (install, refresh, set, remove,
  update, bg-set, colors-from-alacritty, current, etc.)
- Add omarchy restart/hook scripts (btop, hyprctl, hypridle, mako, tmux)
- Add installer/environment.sh for shared env vars
- Add 19 theme directories with colors.toml, vscode.json, backgrounds,
  and app-specific configs (catppuccin, everforest, gruvbox, nord,
  tokyo-night, rose-pine, etc.)
- Update bing-wallpaper script to use new .config/omarchy path

themes/lumon/hyprland.conf

@@ -0,0 +1,26 @@
+$activeBorderColor = rgb(f2fcff)
+$activeShadowColor = rgb(6fb8e3)
+$inactiveBorderColor = rgba(30486099)
+$inactiveShadowColor = rgba(30486077)
+
+general {
+    col.active_border = $activeBorderColor
+    col.inactive_border = $inactiveBorderColor
+    gaps_in = 8
+    gaps_out = 16
+}
+
+group {
+    col.border_active = $activeBorderColor
+    col.border_inactive = $inactiveBorderColor
+}
+
+decoration {
+    shadow {
+      enabled = true
+      range = 16
+      render_power = 4
+      color = $activeShadowColor
+      color_inactive = $inactiveShadowColor
+    }
+}