Implement FastAPI Temporal MVP pipeline

app/api/schemas/asset.py

@@ -0,0 +1,23 @@
+"""Asset API schemas."""
+
+from datetime import datetime
+from typing import Any
+
+from pydantic import BaseModel, ConfigDict
+
+from app.domain.enums import AssetType, WorkflowStepName
+
+
+class AssetRead(BaseModel):
+    """Serialized asset response."""
+
+    model_config = ConfigDict(from_attributes=True)
+
+    id: int
+    order_id: int
+    asset_type: AssetType
+    step_name: WorkflowStepName | None
+    uri: str
+    metadata_json: dict[str, Any] | None
+    created_at: datetime
+