Rebrand the guest page and host console as JohnFeed

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

web/guest.html

@@ -1,9 +1,9 @@
 <!doctype html>
 <html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1">
 <meta name="robots" content="noindex">
-<title>MMO Guest Line</title><link rel="stylesheet" href="/static/style.css"></head>
+<title>JohnFeed</title><link rel="stylesheet" href="/static/style.css"></head>
 <body>
-<header><h1>MMO Guest Line</h1><span id="conn" class="pill">connecting…</span></header>
+<header><h1>JohnFeed</h1><span id="conn" class="pill">connecting…</span></header>
 <div id="fatal" class="banner hidden"></div>
 <main class="grid">
   <section class="card" id="audio">