feat: embed native VST GUI in mastering + fx rack panels (bridge --fx-gui frame capture + input relay)
Linux parts (0L1-4L1 per TASKS_LINUX_WINDOWS.md):
- native_bridge: FxGuiServer.cpp HTTP server (Winsock) — /frame BitBlt +
PrintWindow fallback -> JPEG (libjpeg-turbo q70), /input PostMessage relay
(mouse/wheel/key, coords scaled), /close, /ping; RenderFxJob fxGuiSetup +
run_fx_gui_server (offscreen); main.cpp --fx-gui dispatch; vcpkg +
CMakeLists WIN32-only + JPEG.
- api: open_fx_gui embed flag spawn --fx-gui, parse SF_FXGUI_PORT -> embed_url,
fx-gui/close endpoint; 4 unit tests.
- ui: VstGuiEmbed component (frame refresh 100ms, ping 2s, input relay,
scale coords) shared by MasteringModal + FXRackModal; swap graph<->GUI,
cleanup on unmount, dead-bridge toast fallback.
- docs: TASKS_LINUX_WINDOWS.md, WALKTHROUGH_WINDOWS.md, PLAN status.
Windows tasks 0W1-4W1 remain (build + E2E real VST).
3dtours
c382afe2a6