feat: add native Tomie adapter and strict import compatibility checks

backend/app/worker.py

@@ -94,7 +94,7 @@ async def _convert(version_id: int, source: Path, filename: str) -> bool:
         version.report = result.report
         version.size_bytes = result.size
         game = await db.get(Game, version.game_id)
-        if game:
+        if game and game.main_version_id in (None, version.id):
             game.engine = result.report.get("engine", "renpy")
         if game and not game.cover_hash and result.cover_source:
             try: