rendertarget multi frame rewrite

interfaces/Crafter.Graphics-ForwardDeclarations.cppm

@@ -0,0 +1,29 @@
+/*
+Crafter®.Graphics
+Copyright (C) 2026 Catcrafts®
+catcrafts.net
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License version 3.0 as published by the Free Software Foundation;
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
+*/
+
+export module Crafter.Graphics:ForwardDeclarations;
+import std;
+
+export namespace Crafter {
+    template<std::uint8_t Frames = 1>
+    struct RendertargetBase;
+
+    struct GridElement;
+    struct Window;
+}