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

src/core/mod.rs

@@ -1,10 +1,17 @@
+pub mod analysis;
+pub mod backup;
 pub mod database;
 pub mod discovery;
 pub mod duplicates;
+pub mod footprint;
 pub mod fuse;
 pub mod inspector;
 pub mod integrator;
 pub mod launcher;
+pub mod notification;
 pub mod orphan;
+pub mod report;
+pub mod security;
 pub mod updater;
+pub mod watcher;
 pub mod wayland;