V45.38: suppress iZotope 0x7E dialog

- _is_vst2_dll: pure-Python PE export-table check (magic-aware dd offset
  PE32+112) -> IZOzone11Core.dll (runtime lib, no VSTPluginMain) dropped
  from VST2 lists in _scan_plugins and list_scan_all; plugins.py same.
- _hidden_desktop_startupinfo: scan subprocess runs on hidden desktop
  (user32 CreateDesktopW, HDESK restype) -> third-party MessageBox invisible.
- SetErrorMode(SEM_FAILCRITICALERRORS|SEM_NOOPENFILEERRORBOX) in all 4
  bridge mains: missing dependency DLL fails silently instead of blocking.

native_bridge/src/plugin_host_main.cpp

@@ -86,6 +86,11 @@ static HWND make_host_window() {
 }
 
 int main(int argc, char* argv[]) {
+#ifdef _WIN32
+    // Suppress Windows loader error dialogs — plugin dependency thiếu (0x7E)
+    // phải fail âm thầm, không MessageBox chặn user.
+    SetErrorMode(SEM_FAILCRITICALERRORS | SEM_NOOPENFILEERRORBOX);
+#endif
     std::string shmName, path, presetFile;
     double sr = 44100.0;
     uint32_t block = AUDIO_BLOCK_SIZE;