Scaffold Engine application interfaces

Data/Engine/interfaces/http/admin.py

@@ -0,0 +1,21 @@
+"""Administrative HTTP interface placeholders for the Engine."""
+
+from __future__ import annotations
+
+from flask import Blueprint, Flask
+
+
+blueprint = Blueprint("engine_admin", __name__, url_prefix="/api/admin")
+
+
+def register(app: Flask) -> None:
+    """Attach administrative routes to *app*.
+
+    Concrete endpoints will be migrated in subsequent phases.
+    """
+
+    if "engine_admin" not in app.blueprints:
+        app.register_blueprint(blueprint)
+
+
+__all__ = ["register", "blueprint"]