Clean up repository: remove build artifacts and local files from git tracking

REPO_STRUCTURE.md

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+# Repository Structure
+
+## Essential Files (on GitHub)
+
+### Application Core
+- backend/ - Flask application code
+- frontend/ - Web interface (HTML, CSS, JS)
+- uploads/ - File upload directory
+
+### Docker Configuration
+- docker-compose.yml - Production deployment
+- docker-compose.build.yml - Build from source
+- Dockerfile - Docker image definition
+
+### Scripts
+- backup-complete.sh - Complete system backup
+- restore-complete.sh - Restore from backup
+- backup-docker-image-only.sh - Docker image backup
+- list-backups.sh - List all backups
+- backup.sh - Database backup
+- restore.sh - Database restore
+- setup-auto-backup.sh - Automated backup setup
+- quick-start.sh - Quick installation script
+- init-fresh-install.sh - Initialize directories
+- push-to-ghcr.sh - Push to GitHub Container Registry
+- setup-ghcr-deployment.sh - GHCR deployment setup
+
+### Documentation
+- README.md - Main documentation
+- INSTALL.md - Installation guide
+- .gitignore - Git ignore rules
+
+### Screenshots
+- screenshots/ - Application screenshots
+
+## Excluded Files (local only)
+
+### Build Artifacts
+- AppDir/, AppImage/ - AppImage build files
+- appimagetool-x86_64.AppImage - AppImage tool
+- *.AppImage - Built AppImage files
+- deb-build/ - Debian package build
+
+### Development
+- venv/ - Python virtual environment
+- data/ - Local data directory
+- backups/ - Local backup files
+
+### Security
+- security-reports/ - Security scan reports
+- trivy-report.json - Trivy scan results
+
+### Other
+- templates/ - Unused template directory
+- README - Duplicate readme file