V44: fix crackle - uu tien audio thread bridge (HIGHEST) + FILL 24 (cushion ~90ms) PDC 7936

native_bridge/juce_fx/JuceFxLoop.cpp

@@ -121,7 +121,7 @@ int run_juce_fx_loop(const std::string& jobPath, const std::string& shmName,
 
 #ifdef _WIN32
     timeBeginPeriod(1);
-    SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_ABOVE_NORMAL);
+    SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_HIGHEST);
 #endif
 
     // Engine: prepare graph (chain theo fx_chain). sr/block từ job; header là

native_bridge/src/RealtimeFxLoop.cpp

@@ -141,7 +141,7 @@ int run_realtime_fx_loop(const std::string& jobPath, const std::string& shmName,
     // (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);
+    SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_HIGHEST);
 #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