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/hackerman/colors.toml

@@ -0,0 +1,23 @@
+accent = "#82FB9C"
+cursor = "#ddf7ff"
+foreground = "#ddf7ff"
+background = "#0B0C16"
+selection_foreground = "#0B0C16"
+selection_background = "#ddf7ff"
+
+color0 = "#3E4058"
+color1 = "#50f872"
+color2 = "#4fe88f"
+color3 = "#50f7d4"
+color4 = "#829dd4"
+color5 = "#86a7df"
+color6 = "#7cf8f7"
+color7 = "#85E1FB"
+color8 = "#6a6e95"
+color9 = "#85ff9d"
+color10 = "#9cf7c2"
+color11 = "#a4ffec"
+color12 = "#c4d2ed"
+color13 = "#cddbf4"
+color14 = "#d1fffe"
+color15 = "#ddf7ff"