feat: team portal with own login, SSH web terminal, targets & guide

- Portal tim punya login sendiri (password = ssh_pass, session team_token)
- SSH Web GUI: /api/team/{idx}/ssh/ws (WebSocket+paramiko) → xterm.js terminal
  (fix: ssh_to_ws non-blocking poll, chall_passwords per-container auth)
- Root <slug>.gemastik.imrnes.team → portal tim (bukan login admin)
- Host validation: /team/{idx} & /team/{idx}/guide 403 kalau host != team domain
- /api/team/{idx}/targets: daftar service tim musuh (attack target)
- guide.html: panduan SSH/attack/defense untuk peserta
- fix esc() String(s) (bug: (s||'').replace is not a function saat port number)
- set_ssh_passwords retry loop (container boot race)

panel/static/index.html

@@ -238,7 +238,7 @@ function toast(msg, err=false) {
 }
 
 function esc(s) {
-  return (s||'').replace(/[&<>"']/g, c => ({'&':'&amp;','<':'&lt;','>':'&gt;','"':'&quot;',"'":'&#39;'}[c]));
+  return String(s ?? '').replace(/[&<>"']/g, c => ({'&':'&amp;','<':'&lt;','>':'&gt;','"':'&quot;',"'":'&#39;'}[c]));
 }
 
 function showView(v) {