Rebrand the guest page and host console as JohnFeed

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/host.html

@@ -1,8 +1,8 @@
 <!doctype html>
 <html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1">
-<title>Guest Line Console</title><link rel="stylesheet" href="/static/style.css"></head>
+<title>JohnFeed Console</title><link rel="stylesheet" href="/static/style.css"></head>
 <body>
-<header><h1>Guest Line - host console</h1><span id="conn" class="pill">connecting…</span></header>
+<header><h1>JohnFeed - host console</h1><span id="conn" class="pill">connecting…</span></header>
 <main class="grid">
   <section class="card">
     <h2>Invite</h2>