Update docs and screenshots

backend/tests/test_backup_restore.py

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+from pathlib import Path
+
+from app.backup.service import BackupService
+
+
+def test_backup_and_restore_roundtrip(tmp_path: Path) -> None:
+    data_dir = tmp_path / "data"
+    backup_dir = data_dir / "backups"
+    data_dir.mkdir(parents=True)
+    sample_file = data_dir / "settings.json"
+    sample_file.write_text('{"scene":"base"}', encoding="utf-8")
+
+    service = BackupService(data_dir=data_dir, backup_dir=backup_dir)
+    created = service.create_backup("audit-backup")
+
+    sample_file.write_text('{"scene":"modified"}', encoding="utf-8")
+    service.restore_backup(created.id)
+
+    assert sample_file.read_text(encoding="utf-8") == '{"scene":"base"}'
+    assert any(item.label == "audit-backup" for item in service.list_backups())
+
+
+def test_restore_empty_backup_clears_runtime_files(tmp_path: Path) -> None:
+    data_dir = tmp_path / "data"
+    backup_dir = data_dir / "backups"
+    data_dir.mkdir(parents=True)
+
+    service = BackupService(data_dir=data_dir, backup_dir=backup_dir)
+    empty_backup = service.create_backup("empty-runtime")
+
+    sample_file = data_dir / "settings.json"
+    sample_file.write_text('{"scene":"modified"}', encoding="utf-8")
+    service.restore_backup(empty_backup.id)
+
+    assert not sample_file.exists()