port: GrpImageInstance/GrpExpandedImageInstance verbatim; fix SCREEN blend factor

Both units are the 40250 bodies; only the PDT-stream draw becomes
UIRenderAddImage (with the rendering mode). SCREEN/COLOR_DODGE were packed as
0x28 (INVDESTALPHA+ONE); 40250 uses INVDESTCOLOR+ONE (0x2A). OnIsType calls the
base OnIsType instead of 40250's recursing IsType. port.grp_resource covers the
quads, UVs, colour and blend mode.

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

audit/port-map/EterLib/GrpFontTexture.cpp.json

@@ -0,0 +1,53 @@
+{
+  "reference": "EterLib/GrpFontTexture.cpp",
+  "reference_sha256": "d50b85e6e494b2e2a10289f40a5ebc518be03e1e73d60cd7463fd2dc5032ba00",
+  "priority": "P4",
+  "contracts": [],
+  "functions": {
+    "CGraphicFontTexture::CGraphicFontTexture": {
+      "status": "TODO"
+    },
+    "CGraphicFontTexture::~CGraphicFontTexture": {
+      "status": "TODO"
+    },
+    "CGraphicFontTexture::Initialize": {
+      "status": "TODO"
+    },
+    "CGraphicFontTexture::IsEmpty": {
+      "status": "TODO"
+    },
+    "CGraphicFontTexture::Destroy": {
+      "status": "TODO"
+    },
+    "CGraphicFontTexture::CreateDeviceObjects": {
+      "status": "TODO"
+    },
+    "CGraphicFontTexture::DestroyDeviceObjects": {
+      "status": "TODO"
+    },
+    "CGraphicFontTexture::Create": {
+      "status": "TODO"
+    },
+    "CGraphicFontTexture::GetFont": {
+      "status": "TODO"
+    },
+    "CGraphicFontTexture::AppendTexture": {
+      "status": "TODO"
+    },
+    "CGraphicFontTexture::UpdateTexture": {
+      "status": "TODO"
+    },
+    "CGraphicFontTexture::GetCharacterInfomation": {
+      "status": "TODO"
+    },
+    "CGraphicFontTexture::UpdateCharacterInfomation": {
+      "status": "TODO"
+    },
+    "CGraphicFontTexture::CheckTextureIndex": {
+      "status": "TODO"
+    },
+    "CGraphicFontTexture::SelectTexture": {
+      "status": "TODO"
+    }
+  }
+}