refactor: remove VLESS/Xray, Hy2-only stack

Co-authored-by: Cursor <cursoragent@cursor.com>

panel/static/app.js

@@ -72,15 +72,14 @@ document.querySelectorAll(".copy-row").forEach((row) => {
   btn.addEventListener("click", async () => {
     const card = row.closest(".node-card");
     const nodeId = card?.dataset.id;
-    const kind = btn.dataset.linkKind || input.dataset.linkKind || "vless";
     let text = input.value;
 
     if (nodeId) {
       try {
         const nodes = await fetchNodeLinks();
         const node = nodes.find((item) => String(item.id) === String(nodeId));
-        if (node?.links) {
-          text = kind === "hy2" ? node.links.hy2 : node.links.vless;
+        if (node?.links?.hy2) {
+          text = node.links.hy2;
         }
       } catch {
         /* fall back to input.value */