feat(ui): Terminal tab — embedded blackflame ttyd to CT300 (claude in persistent tmux)

ttyd on CT300 (:7681, firewalled to Traefik) behind same-origin /terminal via
Traefik + CF Access; iframe view + nav entry.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

public/app.js

@@ -24,6 +24,7 @@ const VIEWS = {
   'sacred-valley': () => import('./views/sacred_valley.js'),
   sentinel:        () => import('./views/sentinel.js'),
   'little-blue':   () => import('./views/little_blue.js'),
+  terminal:        () => import('./views/terminal.js'),
   jobs:            () => import('./views/jobs.js')
 };