fix missing packages, remove dead code, replace ponymix with pactl

- Add wl-clipboard, libnotify, upower, bluez, bluez-utils to official.txt
- Remove stow (installed but never used)
- Remove dead moonlock.service cp block from post-install.sh
- Rewrite moonarch-sink-switcher and moonarch-volume to use pactl
  instead of ponymix (already available via libpulse)

packages/official.txt

@@ -36,6 +36,10 @@ sshfs
 nmap
 wget
 
+# Bluetooth
+bluez
+bluez-utils
+
 # Audio (PipeWire)
 pipewire
 pipewire-alsa
@@ -56,6 +60,9 @@ xwayland-satellite
 waybar
 dunst
 cliphist
+wl-clipboard
+libnotify
+upower
 swww
 brightnessctl
 gtklock
@@ -90,7 +97,6 @@ go
 neovim
 npm
 rustup
-stow
 
 # System
 docker