Switch desktop environment from Hyprland to Pantheon

Configures Pantheon (LightDM + gala) for daily use on this ASUS TUF
Gaming A15 (FA507NU), and drops everything that only existed to serve
the previous Hyprland/Quickshell setup:

- desktop.nix: services.desktopManager.pantheon instead of
  programs.hyprland + greetd; comfy laptop touchpad defaults.
- drivers.nix: NVIDIA PRIME render offload between the AMD Radeon 680M
  (drives the panel) and the RTX 4050 Max-Q (offload-only), using this
  machine's real PCI bus IDs; asusd/supergfxd for ASUS-specific laptop
  control.
- apps.nix / scripts.nix: removed Hyprland/Quickshell-only packages and
  scripts (kitty, rofi, quickshell, mako, hyprlock, hyprpaper/mpvpaper,
  the Quickshell theme-picker scripts, cursor/wallpaper/display
  helpers) — Pantheon ships its own Files/Terminal/Screenshot/
  notifications/theming natively. Kept the DE-agnostic scripts (vault
  toggle, metadata stripping, brightness control, Wi-Fi hotspot,
  telemetry, weather).
- theme.nix and default-apps.nix deleted entirely — Pantheon owns
  GTK/icon theming itself, no more live dconf/CSS generation pipeline
  needed.
- Deleted hyprland/ and dotfiles/ (kitty, mako, quickshell, rofi).

Verified with `nixos-rebuild build`.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RpiovBQL6k5MTDMN3Ln9nL

modules/scripts/vault-toggle.sh

@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+
+CIPHER_DIR="/run/media/nexoniarz/Lukas/.vault_cipher"
+MOUNT_DIR="$HOME/Vault"
+
+mkdir -p "$CIPHER_DIR" "$MOUNT_DIR"
+
+if mountpoint -q "$MOUNT_DIR"; then
+    echo "[*] Synchronizing buffers and unmounting Vault..."
+    sync
+
+    if fusermount -u "$MOUNT_DIR"; then
+        echo "[+] Vault unmounted successfully."
+    else
+        echo "[!] Failed to unmount Vault. Check if any application is using $MOUNT_DIR"
+        exit 1
+    fi
+else
+    echo "[*] Mounting Vault..."
+    if [ ! -f "$CIPHER_DIR/gocryptfs.conf" ]; then
+        echo "[!] Container not initialized. Initializing new gocryptfs vault..."
+        gocryptfs -init "$CIPHER_DIR" || exit 1
+    fi
+    if gocryptfs -allow_other "$CIPHER_DIR" "$MOUNT_DIR"; then
+        echo "[+] Vault mounted successfully at $MOUNT_DIR"
+    else
+        echo "[!] Mount failed."
+        exit 1
+    fi
+fi