refactor: migrate to template-based theme system, clean up old per-theme configs

- Remove per-theme app configs (alacritty, foot, ghostty, hyprland,
  hyprlock, mako, rofi, swayosd, tmux, walker, waybar, etc.) now
  handled by default/themed/ templates
- Update omarchy scripts (bg-next, list, set) for new template flow
- Update configs: bootstrap, nvim, rofi, tmux, mako
- Tweak installers (02-install-base.sh, btop, desktop, goose, nvim,
  obsidian, theme, tmux)
- Remove obsolete hyprland-rofi-* and hyprland-walker-* scripts
- Update neovim.lua across remaining themes

themes/tokyo-night/neovim.lua

@@ -1,19 +1,12 @@
 return {
-    {
-        "folke/tokyonight.nvim",
-        lazy = false,
-        priority = 1000,
-        config = function()
-            require("tokyonight").setup({
-                style = "night",
-                transparent = true,
-                terminal_colors = true,
-                styles = {
-                    sidebars = "transparent",
-                    floats = "transparent",
-                },
-            })
-            vim.cmd("colorscheme tokyonight")
-        end,
-    },
+	{
+		"folke/tokyonight.nvim",
+		priority = 1000,
+	},
+	{
+		"LazyVim/LazyVim",
+		opts = {
+			colorscheme = "tokyonight-night",
+		},
+	},
 }