feat: add tenant-scoped Tinker model aliases (#614)

Return the Tinker API key to ART clients and expose /v1/models alias management so tenant-scoped routing works through the OpenAI-compatible Tinker server.

Made-with: Cursor

Author: bradhilton

src/art/tinker/backend.py

@@ -3,6 +3,8 @@
 
 from mp_actors import move_to_child_process
 
+from .. import dev
+from ..backend import AnyTrainableModel
 from ..local.backend import LocalBackend
 from ..local.service import ModelService
 from ..model import TrainableModel
@@ -26,6 +28,19 @@ def __init__(
             os.environ["TINKER_API_KEY"] = tinker_api_key
         super().__init__(in_process=in_process, path=path)
 
+    async def _prepare_backend_for_training(
+        self,
+        model: AnyTrainableModel,
+        config: dev.OpenAIServerConfig | None = None,
+    ) -> tuple[str, str]:
+        api_key = os.environ["TINKER_API_KEY"]
+        config_dict: dict = dict(config or {})
+        server_args = dict(config_dict.get("server_args", {}))
+        server_args["api_key"] = api_key
+        config_dict["server_args"] = server_args
+        base_url, _ = await super()._prepare_backend_for_training(model, config)
+        return base_url, api_key
+
     async def _get_service(self, model: TrainableModel) -> ModelService:
         from ..dev.get_model_config import get_model_config
         from ..dev.model import TinkerArgs, TinkerTrainingClientArgs