Add an endpoint for listing all control points.

game/server/controlpoints/routes.py

@@ -0,0 +1,15 @@
+from fastapi import APIRouter, Depends
+
+from game import Game
+from .models import ControlPointJs
+from ..dependencies import GameContext
+
+router: APIRouter = APIRouter(prefix="/control-points")
+
+
+@router.get("/")
+def list_control_points(game: Game = Depends(GameContext.get)) -> list[ControlPointJs]:
+    control_points = []
+    for control_point in game.theater.controlpoints:
+        control_points.append(ControlPointJs.for_control_point(control_point))
+    return control_points