fix: guide link IDOR, full team-api IDOR hardening, loading overlay

- guide link now server-side replaced to /team/<idx>/guide (no /team/0 403)
- _check_team_host() applied to ALL team endpoints (login, info, targets,
  status, guide, portal, ssh-ws): host must match team domain; panel/gemastik
  host only with admin session. Cross-domain session reuse -> 403.
- host check BEFORE auth on info/targets (no team-existence oracle)
- loading overlay (spinner + text) on start/stop all-team/set; JS util
  showLoading/hideLoading

panel/static/index.html

@@ -83,6 +83,15 @@
   }
   .toast.show { opacity:1; transform:translateY(0); }
   .toast.err { border-color:#f87171; color:#fca5a5; }
+  /* loading overlay */
+  #loadingOverlay {
+    display:none; position:fixed; inset:0; background:rgba(4,8,14,0.82); z-index:2000;
+    align-items:center; justify-content:center; flex-direction:column; gap:18px;
+  }
+  #loadingOverlay.show { display:flex; }
+  .loader { width:44px; height:44px; border:4px solid #2a3444; border-top-color:#38bdf8; border-radius:50%; animation:spin 0.9s linear infinite; }
+  @keyframes spin { to { transform:rotate(360deg); } }
+  #loadingText { color:#dbe6f4; font-size:14px; text-align:center; padding:0 24px; line-height:1.6; }
   .history-box {
     background:#0a101f; border:1px solid #1e3a5f; border-radius:10px; padding:14px;
     font-size:11px; color:#7dd3fc; max-height:300px; overflow-y:auto; white-space:pre-wrap;
@@ -219,6 +228,12 @@
 
 <div class="toast" id="toast"></div>
 
+<!-- loading overlay -->
+<div id="loadingOverlay">
+  <div class="loader"></div>
+  <div id="loadingText">Memproses…</div>
+</div>
+
 <script>
 let CURRENT = null;
 let REFRESH_MS = 15000;
@@ -237,6 +252,16 @@ function toast(msg, err=false) {
   setTimeout(() => t.className = 'toast', 3000);
 }
 
+function showLoading(html) {
+  const ov = document.getElementById('loadingOverlay');
+  document.getElementById('loadingText').innerHTML = html;
+  ov.classList.add('show');
+  return ov;
+}
+function hideLoading() {
+  document.getElementById('loadingOverlay').classList.remove('show');
+}
+
 function esc(s) {
   return String(s ?? '').replace(/[&<>"']/g, c => ({'&':'&amp;','<':'&lt;','>':'&gt;','"':'&quot;',"'":'&#39;'}[c]));
 }
@@ -448,10 +473,12 @@ async function setTeams() {
     if (inp && inp.value.trim()) labels[i] = inp.value.trim();
   }
   try {
+    showLoading(`Membuat ${n} team…<br>Generate compose, flags, domain, Traefik config`);
     const d = await api('/api/teams/set', {method:'POST', headers:{'Content-Type':'application/json'}, body: JSON.stringify({count: n, labels})});
     toast(`Team dibuat: ${d.created.join(', ') || 'tidak ada yang baru'} · total ${d.total}`, false);
     loadTeams();
   } catch (e) { toast(e.message, true); }
+  finally { hideLoading(); }
 }
 
 function teamCountChanged() {
@@ -468,20 +495,28 @@ function teamCountChanged() {
 }
 
 async function startTeam(idx) {
-  try { await api('/api/teams/start', {method:'POST', headers:{'Content-Type':'application/json'}, body: JSON.stringify({index: idx})}); toast(`Team ${idx} start (build bisa makan waktu)`, false); setTimeout(loadTeams, 3000); }
+  const ov = showLoading(`Menyiapkan Team ${idx}…<br>Membangun & start container (bisa butuh 1-3 menit)`);
+  try { await api('/api/teams/start', {method:'POST', headers:{'Content-Type':'application/json'}, body: JSON.stringify({index: idx})}); toast(`Team ${idx} start`, false); }
   catch (e) { toast(e.message, true); }
+  finally { hideLoading(); setTimeout(loadTeams, 2500); }
 }
 async function stopTeam(idx) {
+  const ov = showLoading(`Menghentikan Team ${idx}…`);
   try { await api('/api/teams/stop', {method:'POST', headers:{'Content-Type':'application/json'}, body: JSON.stringify({index: idx})}); toast(`Team ${idx} stop`, false); loadTeams(); }
   catch (e) { toast(e.message, true); }
+  finally { hideLoading(); }
 }
 async function startAllTeams() {
+  const ov = showLoading('Start SEMUA team…<br>Ini bisa butuh beberapa menit (build + boot + set password)');
   try { const d = await api('/api/teams/start', {method:'POST', headers:{'Content-Type':'application/json'}, body: JSON.stringify({})}); toast(`Start semua: ${d.results.filter(r=>r.ok).length}/${d.results.length} ok`, false); setTimeout(loadTeams, 4000); }
   catch (e) { toast(e.message, true); }
+  finally { hideLoading(); }
 }
 async function stopAllTeams() {
+  const ov = showLoading('Menghentikan SEMUA team…');
   try { const d = await api('/api/teams/stop', {method:'POST', headers:{'Content-Type':'application/json'}, body: JSON.stringify({})}); toast(`Stop semua: ${d.results.filter(r=>r.ok).length}/${d.results.length} ok`, false); loadTeams(); }
   catch (e) { toast(e.message, true); }
+  finally { hideLoading(); }
 }
 
 async function randomizeTeam(idx) {