Migrate to chezmoi with per-host sway/waybar configs

- Restructure repo into chezmoi source layout (dot_ prefix)
- Add .chezmoi.toml.tmpl mapping hostname to hosttype (laptop/desktop)
- Template sway config.d fragments (outputs/inputs/binds) per host
- Template waybar config.jsonc with shared bar/module definitions
- Host-scope pulsemeeter (flow) and teams-for-linux (desktop hosts) via .chezmoiignore
- Trim install.sh package lists to configured software + config deps
- Remove stale kitty.conf.bak and untracked host fragments

dot_config/nvim/lua/plugins/theme.lua

@@ -0,0 +1,8 @@
+return {
+  "catppuccin/nvim",
+  name = "catppuccin",
+  priority = 1000, -- Load before other plugins so colorscheme is set first
+  config = function()
+    vim.cmd("colorscheme catppuccin")
+  end,
+}