feat: support builtin script for enhanced mode

src-tauri/src/enhance/builtin/hy_alpn.js

@@ -0,0 +1,10 @@
+function main(params) {
+  if (Array.isArray(params.proxies)) {
+    params.proxies.forEach((p, i) => {
+      if (p.type === "hysteria" && typeof p.alpn === "string") {
+        params.proxies[i].alpn = [p.alpn];
+      }
+    });
+  }
+  return params;
+}