fix(fxrt): mo GUI VST khong gay crackle - GUI spawn BELOW_NORMAL, mien watchdog khi mo native GUI, realtime loop ABOVE_NORMAL

native_bridge/src/RealtimeFxLoop.cpp

@@ -162,6 +162,11 @@ int run_realtime_fx_loop(const std::string& jobPath, const std::string& shmName,
     // cuối. (winmm đã link sẵn — CMakeLists fx_vst_bridge.)
 #ifdef _WIN32
     timeBeginPeriod(1);
+    // Thread audio realtime ABOVE_NORMAL: khong bi tien trinh NORMAL khac
+    // (fx-gui spawn + VST load instance thu 2, native VSTi GUI open...) preempt
+    // -> underrun -> am bi "bop nghet"/ngat quan. ChannelWorker (main.cpp)
+    // da dung THREAD_PRIORITY_ABOVE_NORMAL.
+    SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_ABOVE_NORMAL);
 #endif
     // Chờ chain ĐẦU TIÊN được worker build xong (gen>=1) trước khi READY.
     // setChain() là ASYNC — worker thread load VST3 + preset mất 1-4s; nếu set