port: FlyingData/Instance/ObjectManager/FlyTrace + effect/fly modules (batch 2 P1)

Verbatim copies of the 40250 flying-object units and the effect/fly
Python modules replace the pending CFlyingManager stand-in and the two
module stubs; initeffect/initfly run after initnet as in 40250 and the
flying manager gets the background as its map manager.
CMapManager::GetTerrainHeight is added over the native height tiles.
login_flow checks playersettingmodule registered the indexed fly data.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

audit/port-map/UserInterface/PythonFlyModule.cpp.json

@@ -0,0 +1,26 @@
+{
+  "reference": "UserInterface/PythonFlyModule.cpp",
+  "reference_sha256": "3afa92192ab630875c922b1901f1c3ea2aa9e82390121c426a74079a455841f7",
+  "priority": "P4",
+  "contracts": [],
+  "functions": {
+    "flyUpdate": {
+      "status": "PORTED",
+      "impl": [
+        "extension/src/port/UserInterface/PythonFlyModule.cpp:flyUpdate"
+      ]
+    },
+    "flyRender": {
+      "status": "PORTED",
+      "impl": [
+        "extension/src/port/UserInterface/PythonFlyModule.cpp:flyRender"
+      ]
+    },
+    "initfly": {
+      "status": "PORTED",
+      "impl": [
+        "extension/src/port/UserInterface/PythonFlyModule.cpp:initfly"
+      ]
+    }
+  }
+}