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

README.md

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+# Driftwood
+
+A modern GTK4/libadwaita AppImage manager for GNOME desktops.
+
+Driftwood discovers, inspects, integrates, updates, and audits AppImage files
+with a clean GNOME-native interface built for the Wayland era.
+
+## Features
+
+- **Library management** - Scan directories to discover AppImages, view them in
+  grid or list mode with status badges for FUSE, Wayland, and update status
+- **Desktop integration** - Create .desktop files and install icons with one click
+- **FUSE and Wayland detection** - Automatically detect compatibility and suggest
+  launch methods (direct, extract-and-run, or sandboxed)
+- **Update checking** - Read embedded update information (GitHub Releases, GitLab,
+  zsync) and check for newer versions
+- **Security scanning** - Extract bundled shared libraries and check them against
+  the OSV.dev vulnerability database
+- **Duplicate detection** - Find AppImages that are different versions of the same
+  app or identical files in different locations
+- **Disk footprint analysis** - Discover config, data, and cache files associated
+  with each AppImage
+- **Sandboxing** - Optional Firejail sandbox support per-app
+- **Orphan cleanup** - Detect and remove .desktop files for AppImages that no
+  longer exist
+- **CLI interface** - Full command-line access to all core features
+
+## Requirements
+
+- GTK 4.16+
+- libadwaita 1.6+
+- SQLite 3
+- gettext
+
+Optional:
+- firejail (for sandboxed launches)
+- fuse2/fuse3 (for AppImage FUSE mounting)
+- appimageupdate (for delta updates)
+
+## Building from source
+
+```sh
+# Development build (uses cargo directly)
+cargo build
+cargo run
+
+# System installation (uses meson)
+meson setup build --prefix=/usr
+meson compile -C build
+sudo meson install -C build
+```
+
+## CLI usage
+
+```sh
+# Scan configured directories for AppImages
+driftwood scan
+
+# List all known AppImages
+driftwood list
+driftwood list --format json
+
+# Inspect a specific AppImage
+driftwood inspect ~/Applications/Firefox.AppImage
+
+# Integrate into desktop menu
+driftwood integrate ~/Applications/Firefox.AppImage
+
+# Check for updates
+driftwood check-updates
+
+# Run a security scan
+driftwood security
+driftwood security ~/Applications/Firefox.AppImage
+
+# Launch with tracking
+driftwood launch ~/Applications/Firefox.AppImage
+driftwood launch --sandbox ~/Applications/Firefox.AppImage
+
+# Find duplicates
+driftwood duplicates
+
+# Show disk footprint
+driftwood footprint ~/Applications/Firefox.AppImage
+
+# System status
+driftwood status
+
+# Clean orphaned entries
+driftwood clean-orphans
+```
+
+## Packaging
+
+- **Flatpak**: See `build-aux/app.driftwood.Driftwood.json`
+- **Arch Linux (AUR)**: See `packaging/PKGBUILD`
+
+## License
+
+GPL-3.0-or-later