feat(engine): scaffold runtime skeleton

Data/Engine/services/API/__init__.py

@@ -0,0 +1,21 @@
+"""API service stubs for the Borealis Engine runtime.
+
+Stage 1 only establishes the package layout. Future stages will populate this
+module with blueprint factories that wrap the legacy API helpers.
+"""
+from __future__ import annotations
+
+from flask import Flask
+
+from ...server import EngineContext
+
+
+def register_api(app: Flask, context: EngineContext) -> None:
+    """Placeholder hook for API blueprint registration.
+
+    Later migration stages will import domain-specific blueprint modules and
+    attach them to ``app`` using the shared :class:`EngineContext`. For now we
+    simply log the intent so tooling can verify the hook is wired.
+    """
+
+    context.logger.debug("Engine API services are not yet implemented.")