ci: add automated Gitea Actions deployment workflow for Synology NAS

- Add Gitea Actions workflow for automated build and deployment
- Add deployment script for Synology NAS
- Add Docker Compose configurations for production deployment
- Add Gitea runner setup
- Add comprehensive documentation for CI/CD setup
- Add health check endpoint for deployment verification
- Update .gitignore for CI/CD artifacts

.gitignore

@@ -39,6 +39,14 @@ yarn-error.log
 /database/*.sqlite
 /database/*.sqlite-journal
 *.sql.gz
+/backups
+
+# CI/CD & Deployment
+.env.synology
+.env.gitea-runner
+kubeconfig
+*.tar.gz
+laravel-app.tar.gz
 
 # Backup & Temporary Files
 *.bak