fix: 阴影采样器 CompareOp 反转（诊断残留 eGreater）+ 移除截图调试设施

根因：shadow sampler 停留在诊断期的 eGreater——比较语义全反，
全场 shade 被压到 0.3 变暗，唯独真影区 lit=1 反而全亮，
即"影子比环境亮、像光源"的现象。修回 eLess 后影子正常。

顺带清理：第 60 帧截图管线（HDRColor/ShadowMap0 → BMP）、
CPU 投影诊断日志、GetCaptureTarget 及 TRANSFER_SRC extraUsage。

Engine/src/RenderGraph/RenderGraph.cpp

@@ -694,24 +694,6 @@ namespace Engine::RG {
         return entry.physical[frameSlot]->view;
     }
 
-    bool RenderGraph::GetCaptureTarget(TextureHandle h, u32 frameSlot,
-                                       vk::Image& outImage, vk::Extent2D& outExtent,
-                                       vk::Format& outFormat,
-                                       vk::ImageLayout& outResting) const
-    {
-        const auto& entry = GetEntry(h);
-        if (entry.imported || frameSlot >= entry.physical.size() ||
-            !entry.physical[frameSlot]) {
-            return false;
-        }
-        const auto& phys = *entry.physical[frameSlot];
-        outImage = phys.image;
-        outExtent = phys.extent;
-        outFormat = phys.format;
-        outResting = entry.restingLayout;
-        return true;
-    }
-
     void RenderGraph::SetQueryPool(vk::QueryPool pool, u32 queriesPerFrame)
     {
         m_QueryPool = pool;