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

default/themed/foot.ini.tpl

@@ -0,0 +1,25 @@
+[colors-dark]
+foreground={{ foreground_strip }}
+background={{ background_strip }}
+selection-foreground={{ selection_foreground_strip }}
+selection-background={{ selection_background_strip }}
+
+cursor={{ background_strip }} {{ cursor_strip }}
+
+regular0={{ color0_strip }}
+regular1={{ color1_strip }}
+regular2={{ color2_strip }}
+regular3={{ color3_strip }}
+regular4={{ color4_strip }}
+regular5={{ color5_strip }}
+regular6={{ color6_strip }}
+regular7={{ color7_strip }}
+
+bright0={{ color8_strip }}
+bright1={{ color9_strip }}
+bright2={{ color10_strip }}
+bright3={{ color11_strip }}
+bright4={{ color12_strip }}
+bright5={{ color13_strip }}
+bright6={{ color14_strip }}
+bright7={{ color15_strip }}