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/ristretto/colors.toml

@@ -0,0 +1,23 @@
+accent = "#f38d70"
+cursor = "#c3b7b8"
+foreground = "#e6d9db"
+background = "#2c2525"
+selection_foreground = "#e6d9db"
+selection_background = "#403e41"
+
+color0 = "#72696a"
+color1 = "#fd6883"
+color2 = "#adda78"
+color3 = "#f9cc6c"
+color4 = "#f38d70"
+color5 = "#a8a9eb"
+color6 = "#85dacc"
+color7 = "#e6d9db"
+color8 = "#948a8b"
+color9 = "#ff8297"
+color10 = "#c8e292"
+color11 = "#fcd675"
+color12 = "#f8a788"
+color13 = "#bebffd"
+color14 = "#9bf1e1"
+color15 = "#f1e5e7"

themes/ristretto/vscode.json

@@ -0,0 +1,4 @@
+{
+  "name": "Monokai Pro (Filter Ristretto)",
+  "extension": "monokai.theme-monokai-pro-vscode"
+}