controller: GET /layouts/{instance} + UI fetch dynamic layout list

UI loadLayouts() теперь fetches /layouts/{inst} — берёт actual layout_map
из config'а (не hardcoded), показывает только existing layouts.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

controller/cuda_grid_controller/static/index.html

@@ -4,7 +4,7 @@
 <meta charset="UTF-8">
 <title>cuda-grid control</title>
 <meta name="viewport" content="width=device-width, initial-scale=1">
-<script src="https://cdn.jsdelivr.net/npm/hls.js@1"></script>
+<script src="/ui/lib/hls.js"></script>
 <style>
 :root { --bg:#1a1a1f; --fg:#e6e6e6; --accent:#4af; --muted:#888; --good:#4f8; --warn:#fa4; --err:#f44; }
 * { box-sizing:border-box; }
@@ -171,13 +171,12 @@ async function api(method, path, body=null, okMsg='ok') {
 
 // ── Layout buttons ────────────────────────────────────
 async function loadLayouts() {
-  const r = await fetch('/state');
+  const r = await fetch(`/layouts/${INSTANCE}`);
   if (!r.ok) return;
-  // Hardcode для simplicity — реальный list в controller config layout_map
-  const layouts = ['quad', 'single', 'main_plus_preview'];
+  const d = await r.json();
   const box = document.getElementById('layout-buttons');
   box.innerHTML = '';
-  layouts.forEach(name => {
+  d.layouts.forEach(name => {
     const b = document.createElement('button');
     b.textContent = name;
     b.onclick = () => api('POST', `/layout/${INSTANCE}/set`, {layout:name}, '→ '+name);
@@ -304,13 +303,13 @@ async function refreshState() {
 }
 
 // ── Init ──────────────────────────────────────────────
-ovTypeChanged();
-initVideo();
-loadLayouts();
-loadAudio();
-loadHistory();
-refreshState();
-setInterval(refreshState, 2000);
+// Defensive init — async (non-video) FIRST so кнопки работают независимо от HLS.
+try { ovTypeChanged(); } catch(e) { console.error('ovTypeChanged', e); }
+try { loadLayouts(); } catch(e) { console.error('loadLayouts', e); }
+try { loadAudio(); } catch(e) { console.error('loadAudio', e); }
+try { loadHistory(); } catch(e) { console.error('loadHistory', e); }
+try { refreshState(); setInterval(refreshState, 2000); } catch(e) { console.error('refreshState', e); }
+try { initVideo(); } catch(e) { console.error('initVideo', e); setStatus('video init failed (HLS?)', true); }
 </script>
 </body>
 </html>