node registration fixes

packages/node/meshnet_node/torch_server.py

@@ -1543,6 +1543,17 @@ class TorchNodeServer:
     def loaded_model_ids(self) -> list[str]:
         return list(self._backends.keys())
 
+    def backend_for(self, model_id: str) -> TorchModelShard | None:
+        """The loaded backend serving `model_id` — full repo id or short name."""
+        backend = self._backends.get(model_id)
+        if backend is not None:
+            return backend
+        short = model_id.split("/")[-1].lower()
+        for key, candidate in self._backends.items():
+            if key.split("/")[-1].lower() == short:
+                return candidate
+        return None
+
     def apply_tracker_directives(self, directives: list[dict]) -> dict | None:
         """Apply tracker shard directives (LOAD_SHARD replace, ADD_SHARD load-more)."""
         drop_directive = next(