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

src-tauri/src/lib.rs

@@ -138,6 +138,7 @@ pub fn run() {
                         .shell()
                         .command(&engine_exe)
                         .env("SF_PARENT_PID", std::process::id().to_string())
+                        .env("SF_RESOURCE_DIR", res_dir.to_string_lossy().to_string())
                         .spawn()
                     {
                         Ok((_rx, child)) => {

src-tauri/src/vst_gui.rs

@@ -93,6 +93,7 @@ mod native {
         if let Ok(res) = app.path().resource_dir() {
             candidates.push(res.join(name));
             candidates.push(res.join("native").join(name));
+            candidates.push(res.join("native_host").join(name));
         }
         if let Ok(exe) = std::env::current_exe() {
             if let Some(dir) = exe.parent() {

src-tauri/tauri.conf.json

@@ -33,7 +33,8 @@
       "icons/favicon.ico"
     ],
     "resources": {
-      "resources/daw_engine": "daw_engine/"
+      "resources/daw_engine": "daw_engine/",
+      "resources/native_host": "native_host/"
     },
     "externalBin": [],
     "windows": {