delete back and frontend

add schafkopf os
add build firmware action

schafkopf-os/static/app.js

@@ -0,0 +1,25 @@
+const btn = document.getElementById('pingBtn');
+const versionBtn = document.getElementById('versionBtn');
+const out = document.getElementById('result');
+
+btn?.addEventListener('click', async () => {
+  out.textContent = 'Requesting /api/ping…';
+  try {
+    const res = await fetch('/api/ping');
+    const json = await res.json();
+    out.textContent = JSON.stringify(json, null, 2);
+  } catch (err) {
+    out.textContent = 'Error: ' + (err?.message || String(err));
+  }
+});
+
+versionBtn?.addEventListener('click', async () => {
+  out.textContent = 'Requesting /api/version…';
+  try {
+    const res = await fetch('/api/version');
+    const json = await res.json();
+    out.textContent = JSON.stringify(json, null, 2);
+  } catch (err) {
+    out.textContent = 'Error: ' + (err?.message || String(err));
+  }
+});