Revert "feat(render): Campaign V slice V4d-2 - move terrain onto the RHI"

This reverts commit b064668b63.

src/AcDream.App/Rendering/GameWindowLifetime.cs

@@ -118,6 +118,7 @@ internal sealed record RenderShutdownRoots(
     WbMeshAdapter? MeshAdapter,
     Shader? MeshShader,
     TerrainModernRenderer? Terrain,
+    Shader? TerrainShader,
     SceneLightingUboBinding? SceneLighting,
     DebugLineRenderer? DebugLines,
     TextRenderer? TextRenderer,
@@ -454,6 +455,7 @@ internal static class GameWindowShutdownManifest
             [
                 Hard("mesh shader", () => render.MeshShader?.Dispose()),
                 Hard("terrain", () => render.Terrain?.Dispose()),
+                Hard("terrain shader", () => render.TerrainShader?.Dispose()),
                 Hard("scene lighting", () => render.SceneLighting?.Dispose()),
                 Hard("debug lines", () => render.DebugLines?.Dispose()),
                 Hard("text renderer", () => render.TextRenderer?.Dispose()),