Add Phase 5 enhancements: security, i18n, analysis, backup, notifications

- Database v8 migration: tags, pinned, avg_startup_ms columns
- Security scanning with CVE matching and batch scan
- Bundled library extraction and vulnerability reports
- Desktop notification system for security alerts
- Backup/restore system for AppImage configurations
- i18n framework with gettext support
- Runtime analysis and Wayland compatibility detection
- AppStream metadata and Flatpak-style build support
- File watcher module for live directory monitoring
- Preferences panel with GSettings integration
- CLI interface for headless operation
- Detail view: tabbed layout with ViewSwitcher in title bar,
  health score, sandbox controls, changelog links
- Library view: sort dropdown, context menu enhancements
- Dashboard: system status, disk usage, launch history
- Security report page with scan and export
- Packaging: meson build, PKGBUILD, metainfo

packaging/PKGBUILD

@@ -0,0 +1,41 @@
+# Maintainer: Driftwood Contributors
+
+pkgname=driftwood
+pkgver=0.1.0
+pkgrel=1
+pkgdesc='Modern AppImage manager for GNOME desktops'
+arch=('x86_64')
+url='https://github.com/driftwood-app/driftwood'
+license=('GPL-3.0-or-later')
+depends=(
+    'gtk4'
+    'libadwaita'
+    'sqlite'
+    'gettext'
+)
+makedepends=(
+    'rust'
+    'cargo'
+    'meson'
+    'ninja'
+    'glib2'
+)
+optdepends=(
+    'firejail: sandboxed AppImage launching'
+    'fuse2: FUSE mount support for Type 1 AppImages'
+    'fuse3: FUSE mount support for Type 2 AppImages'
+    'appimageupdate: delta updates for AppImages'
+)
+source=("$pkgname-$pkgver.tar.gz")
+sha256sums=('SKIP')
+
+build() {
+    cd "$pkgname-$pkgver"
+    arch-meson build
+    meson compile -C build
+}
+
+package() {
+    cd "$pkgname-$pkgver"
+    meson install -C build --destdir "$pkgdir"
+}