port: CMapOutdoor + PythonBackground + minimap (1:1 40250)

GameLib map/area/terrain units, PRTerrainLib Terrain/TextureSet,
PythonBackground(+Module) and ColorTransitionHelper ported verbatim;
pending stand-ins and background module stubs removed. Hand edits:
BeginEnvironment's pointer tag via uintptr_t, LoadWaterMap reads the
file's 32-bit longs. Terrain draw passes stay platform no-ops (Godot
draws the terrain). RecordingDevice gains textures, buffers and render
targets; orthographic draws become UI commands so CPythonMiniMap's
masked tiles show through minimap_image_filter in python_ui_surface.

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

audit/port-map/GameLib/TerrainQuadtree.cpp.json

@@ -0,0 +1,20 @@
+{
+  "reference": "GameLib/TerrainQuadtree.cpp",
+  "reference_sha256": "87b38a1510f995b4a0b0646aa8fcd55ee49daac22b0d86f588d073387dd428b1",
+  "priority": "P4",
+  "contracts": [],
+  "functions": {
+    "CTerrainQuadtreeNode::CTerrainQuadtreeNode": {
+      "status": "PORTED",
+      "impl": [
+        "extension/src/port/GameLib/TerrainQuadtree.cpp:CTerrainQuadtreeNode::CTerrainQuadtreeNode"
+      ]
+    },
+    "CTerrainQuadtreeNode::~CTerrainQuadtreeNode": {
+      "status": "PORTED",
+      "impl": [
+        "extension/src/port/GameLib/TerrainQuadtree.cpp:CTerrainQuadtreeNode::~CTerrainQuadtreeNode"
+      ]
+    }
+  }
+}