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/waybar/power_menu.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <object class="GtkMenu" id="menu">
+    <child>
+      <object class="GtkMenuItem" id="logout">
+        <property name="label">Logout</property>
+      </object>
+    </child>
+    <child>
+      <object class="GtkSeparatorMenuItem"/>
+    </child>
+    <child>
+      <object class="GtkMenuItem" id="shutdown">
+        <property name="label">Shutdown</property>
+      </object>
+    </child>
+    <child>
+      <object class="GtkMenuItem" id="reboot">
+        <property name="label">Reboot</property>
+      </object>
+    </child>
+  </object>
+</interface>