Add CRT shader support to Intel QSV pipeline

Insert VAAPI→OpenCL→CRT→VAAPI round-trip (isVaapiDecoder path) and
inline OCL filters (doOclTonemap path) into GetIntelQsvVaapiVidFiltersPrefered
so the CRT Lottes shader is applied when the h264_qsv encoder is active.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs

@@ -4896,6 +4896,12 @@ namespace MediaBrowser.Controller.MediaEncoding
             {
                 if (doOclTonemap)
                 {
+                    // CRT shader while already in OpenCL memory (after tonemap)
+                    if (IsCrtShaderEnabled(state))
+                    {
+                        mainFilters.AddRange(GetCrtShaderOclFilters(state));
+                    }
+
                     // OUTPUT qsv(nv12) surface(vram)
                     // reverse-mapping via qsv(vaapi)-opencl interop.
                     // add extra pool size to avoid the 'cannot allocate memory' error on hevc_qsv.
@@ -4904,6 +4910,14 @@ namespace MediaBrowser.Controller.MediaEncoding
                 }
                 else if (isVaapiDecoder)
                 {
+                    if (IsCrtShaderEnabled(state))
+                    {
+                        // VAAPI → OpenCL → CRT → VAAPI round-trip, then map to QSV
+                        mainFilters.Add("hwmap=derive_device=opencl:mode=read");
+                        mainFilters.AddRange(GetCrtShaderOclFilters(state));
+                        mainFilters.Add("hwmap=derive_device=vaapi:mode=write:reverse=1");
+                    }
+
                     mainFilters.Add("hwmap=derive_device=qsv");
                     mainFilters.Add("format=qsv");
                 }