Fix FastAPI doc pages.

We can't directly use frozen dataclasses from pydcs in our interface
because pydantic can't process them. Pydantic is able to automatically
convert to our modelview type from the pydcs type though.

game/server/mapzones/models.py

@@ -1,9 +1,8 @@
 from __future__ import annotations
 
-from dcs.mapping import LatLng
 from pydantic import BaseModel
 
-from game.server.leaflet import LeafletPoly, ShapelyUtil
+from game.server.leaflet import LeafletPoint, LeafletPoly, ShapelyUtil
 from game.theater import ConflictTheater
 from game.threatzones import ThreatZones
 
@@ -15,7 +14,7 @@ class MapZonesJs(BaseModel):
 
 
 class UnculledZoneJs(BaseModel):
-    position: LatLng
+    position: LeafletPoint
     radius: float