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/catppuccin-latte/colors.toml

@@ -0,0 +1,23 @@
+accent = "#1e66f5"
+cursor = "#dc8a78"
+foreground = "#4c4f69"
+background = "#eff1f5"
+selection_foreground = "#eff1f5"
+selection_background = "#dc8a78"
+
+color0 = "#bcc0cc"
+color1 = "#d20f39"
+color2 = "#40a02b"
+color3 = "#df8e1d"
+color4 = "#1e66f5"
+color5 = "#ea76cb"
+color6 = "#179299"
+color7 = "#5c5f77"
+color8 = "#acb0be"
+color9 = "#d20f39"
+color10 = "#40a02b"
+color11 = "#df8e1d"
+color12 = "#1e66f5"
+color13 = "#ea76cb"
+color14 = "#179299"
+color15 = "#6c6f85"