feat(encode): native QSV backend — libvpl-sys + qsv.rs (Phases 0-3 of design/native-qsv-encoder.md)

Vendored MIT VPL dispatcher (static, trimmed tree, pin 674d015b/v2.17.0) built
via cmake+bindgen behind new feature 'qsv' (pf-encode + punktfunk-host forward).
qsv.rs: dispatcher session on the capture adapter (LUID-matched), SetHandle
D3D11, AsyncDepth=1/GopRefDist=1/VDEnc/CBR + HRD-off low-latency config,
GetSurfaceForEncode + GPU CopySubresourceRegion input (zero-copy, no readback
path), bounded sync-point poll, in-place reset with teardown escalation, no-IDR
bitrate retarget (Reset + StartNewSequence=OFF), 10-bit P010 HEVC-Main10/AV1,
HDR mastering/CLL SEI-OBU at IDR + BT.2020/PQ VSI, LTR-RFI via mfxExtRefListCtrl
(AMF slot policy port, Query-gated per codec, wire-index FrameOrder pinning).
Dispatch: native-first with ffmpeg fallback + PUNKTFUNK_QSV_FFMPEG hatch;
probes (can_encode_10bit / windows_codec_support / windows_backend_is_probed)
now answer natively for QSV.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

crates/libvpl-sys/vendor/libvpl/cmake/PackageTarget.cmake

@@ -0,0 +1,30 @@
+# ##############################################################################
+# Copyright (C) Intel Corporation
+#
+# SPDX-License-Identifier: MIT
+# ##############################################################################
+
+#
+# Packaging
+#
+
+set(CPACK_GENERATOR "ZIP")
+set(CPACK_ARCHIVE_COMPONENT_INSTALL ON)
+
+set(CPACK_PACKAGE_DIRECTORY ${PROJECT_BINARY_DIR})
+set(CPACK_PACKAGE_VERSION_MAJOR ${PROJECT_VERSION_MAJOR})
+set(CPACK_PACKAGE_VERSION_MINOR ${PROJECT_VERSION_MINOR})
+set(CPACK_PACKAGE_VERSION_PATCH ${PROJECT_VERSION_PATCH})
+
+set(VPL_COMPONENT_DEV dev)
+set(VPL_COMPONENT_LIB lib)
+set(VPL_COMPONENT_TOOLS tools)
+
+set(CPACK_COMPONENTS_ALL all ${VPL_COMPONENT_DEV} ${VPL_COMPONENT_LIB}
+                         ${VPL_COMPONENT_TOOLS})
+set(CPACK_COMPONENTS_GROUPING IGNORE)
+
+include(CPack)
+cpack_add_component(${VPL_COMPONENT_LIB})
+cpack_add_component(${VPL_COMPONENT_DEV} DEPENDS ${VPL_COMPONENT_LIB})
+cpack_add_component(${VPL_COMPONENT_TOOLS} DEPENDS ${VPL_COMPONENT_LIB})