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

po/LINGUAS

@@ -0,0 +1,6 @@
+# List of languages with translations
+# Add language codes here as translations are contributed, e.g.:
+# de
+# es
+# fr
+# pt_BR

po/POTFILES.in

@@ -0,0 +1,17 @@
+src/main.rs
+src/application.rs
+src/window.rs
+src/cli.rs
+src/ui/library_view.rs
+src/ui/detail_view.rs
+src/ui/dashboard.rs
+src/ui/preferences.rs
+src/ui/app_card.rs
+src/ui/cleanup_wizard.rs
+src/ui/duplicate_dialog.rs
+src/ui/integration_dialog.rs
+src/ui/security_report.rs
+src/ui/update_dialog.rs
+src/ui/widgets.rs
+data/app.driftwood.Driftwood.metainfo.xml
+data/app.driftwood.Driftwood.desktop

po/meson.build

@@ -0,0 +1 @@
+i18n.gettext('app.driftwood.Driftwood', preset: 'glib')