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/matte-black/colors.toml

@@ -0,0 +1,23 @@
+accent = "#e68e0d"
+cursor = "#eaeaea"
+foreground = "#bebebe"
+background = "#121212"
+selection_foreground = "#bebebe"
+selection_background = "#515151"
+
+color0 = "#333333"
+color1 = "#D35F5F"
+color2 = "#FFC107"
+color3 = "#b91c1c"
+color4 = "#e68e0d"
+color5 = "#D35F5F"
+color6 = "#bebebe"
+color7 = "#bebebe"
+color8 = "#8a8a8d"
+color9 = "#B91C1C"
+color10 = "#FFC107"
+color11 = "#b90a0a"
+color12 = "#f59e0b"
+color13 = "#B91C1C"
+color14 = "#eaeaea"
+color15 = "#ffffff"

themes/matte-black/vscode.json

@@ -0,0 +1,4 @@
+{
+  "name": "Matte Black",
+  "extension": "TahaYVR.matteblack"
+}