build: bundle native_host bridges + fluidsynth runtime vao installer (build_windows.ps1 [4b/6], SF_RESOURCE_DIR fallback, tauri resources native_host)

app/core/native_audio_service.py

@@ -23,8 +23,12 @@ import numpy as np
 
 from app.config import settings
 
-_NATIVE_DIR = os.getenv("SONICFORGE_NATIVE_DIR") or os.path.join(
-    settings.BASE_DIR, "native_host", "build", "Release")
+_RES_DIR = os.getenv("SF_RESOURCE_DIR")
+_NATIVE_DIR = (
+    os.getenv("SONICFORGE_NATIVE_DIR")
+    or (os.path.join(_RES_DIR, "native_host") if _RES_DIR else None)
+    or os.path.join(settings.BASE_DIR, "native_host", "build", "Release")
+)
 
 _ERR = None
 _LOCK = threading.Lock()