feat: native host bridge integration — C++ bridge, Rust SHM, JS routing, build scripts, docs

- native_bridge/: InstrumentEngineManager multi-channel, sample-accurate, CC/program/pitchbend, transport, Vst3Instrument stub (HAVE_VST3SDK)
- src-tauri: shm.rs, bridge spawn + audio pump + health monitor, open_vst_gui, externalBin, commands
- app: UnifiedMidiRouter, NativeBridgeService, bridgeAudioNode, audioRoutingEngine, Plugin Manager UI, Bridge/WASM indicator, set_position sync
- build: 3 ps1 (force-added, build/ ignored), verify_bundle --check-bridge, CI workflow
- docs: TASKS.md, TEST_NOTES.md (Windows verify checklist), install/report updates

native_bridge/CMakeLists.txt

@@ -0,0 +1,59 @@
+cmake_minimum_required(VERSION 3.20)
+project(daw_vst_bridge LANGUAGES C CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+# ── 1. VST3 SDK (Steinberg, vendored as git submodule — NOT in vcpkg) ──
+if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/vst3sdk/CMakeLists.txt")
+  add_subdirectory(vst3sdk EXCLUDE_FROM_ALL)
+  set(VST3_SDK_TARGET sdk)
+else()
+  message(WARNING "vst3sdk submodule missing — VST3 host disabled; SF2/SF3/SFZ still build")
+  set(VST3_SDK_TARGET "")
+endif()
+
+# ── 2. FluidSynth + sfizz ──
+# Windows: vcpkg toolchain (-DCMAKE_TOOLCHAIN_FILE=.../vcpkg.cmake) cung cap
+# headers/libs; pkg_check_modules khong co san tren MSVC.
+# Linux/macOS: pkg-config duoc dung (spec goc).
+if(WIN32)
+  find_path(FLUIDSYNTH_INCLUDE_DIR fluidsynth.h)
+  find_library(FLUIDSYNTH_LIBRARY NAMES fluidsynth libfluidsynth)
+  if(NOT FLUIDSYNTH_INCLUDE_DIR OR NOT FLUIDSYNTH_LIBRARY)
+    message(FATAL_ERROR "fluidsynth not found — cai qua vcpkg: vcpkg install fluidsynth")
+  endif()
+  # sfizz: header sfizz.hpp + lib sfizz (vcpkg export target sfizz::sfizz neu co)
+  find_path(SFIZZ_INCLUDE_DIR sfizz.hpp)
+  find_library(SFIZZ_LIBRARY NAMES sfizz)
+  if(NOT SFIZZ_INCLUDE_DIR OR NOT SFIZZ_LIBRARY)
+    message(FATAL_ERROR "sfizz not found — cai qua vcpkg: vcpkg install sfizz")
+  endif()
+else()
+  find_package(PkgConfig REQUIRED)
+  pkg_check_modules(FLUIDSYNTH REQUIRED fluidsynth)
+  pkg_check_modules(SFIZZ REQUIRED sfizz)
+endif()
+
+include_directories(
+  ${CMAKE_CURRENT_SOURCE_DIR}/include
+  ${FLUIDSYNTH_INCLUDE_DIRS}
+  ${SFIZZ_INCLUDE_DIRS}
+)
+
+add_executable(daw_vst_bridge
+  src/main.cpp
+  src/NativeInstrumentEngine.cpp
+  src/SharedMemoryIPC.cpp
+)
+
+if(VST3_SDK_TARGET)
+  target_link_libraries(daw_vst_bridge PRIVATE ${VST3_SDK_TARGET})
+endif()
+if(WIN32)
+  target_link_libraries(daw_vst_bridge PRIVATE ${FLUIDSYNTH_LIBRARY} ${SFIZZ_LIBRARY})
+  # Required Windows libs
+  target_link_libraries(daw_vst_bridge PRIVATE winmm)
+else()
+  target_link_libraries(daw_vst_bridge PRIVATE ${FLUIDSYNTH_LIBRARIES} ${SFIZZ_LIBRARIES})
+endif()