Add 'business' profile type and category

Business accounts are cli profiles with businessAddress=True, so each connecting
customer gets their own group chat (handled via the existing chat UI) with an
optional welcome auto-reply. New BUSINESS_TYPES, a /business page + sidebar entry,
and a business variant of the create form. profile/chat pages route via a
_category helper. Adds business_test.py (customer connects -> lands in a business
group, not a direct contact) — passes.

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

manager/templates/list.html

@@ -23,13 +23,25 @@
 {% endblock %}
 
 {% block content %}
+{% set new_label = 'User' if tab == 'users' else ('Business' if tab == 'business' else 'Bot') %}
 <div class="flex-between" style="margin-bottom: 24px;">
   <h1 style="margin:0;">{{ tab | title }}</h1>
   <button class="btn btn-primary" onclick="openCreate()">
-    + New {{ 'User' if tab == 'users' else 'Bot' }}
+    + New {{ new_label }}
   </button>
 </div>
 
+{% if tab == 'business' %}
+<div class="card bot-types-card" style="margin-bottom:24px;">
+  <h2 style="font-size:15px;margin-bottom:8px;">Business accounts</h2>
+  <p class="muted" style="font-size:13px;">
+    A business account uses a <strong>business address</strong>: each customer who connects gets
+    their own group chat (so teammates can be added). You handle those conversations here, the same
+    way you chat in a group. Set an optional welcome message to auto-greet new customers.
+  </p>
+</div>
+{% endif %}
+
 {% if tab == 'bots' %}
 <div class="card bot-types-card" style="margin-bottom:24px;">
   <h2 style="font-size:15px;margin-bottom:12px;">Available bot types</h2>
@@ -87,6 +99,9 @@
   {% if tab == 'users' %}
   <strong>No users yet</strong>
   <p>Create a SimpleX user account to manage contacts and channels.</p>
+  {% elif tab == 'business' %}
+  <strong>No business accounts yet</strong>
+  <p>Create a business account; each customer who connects gets their own group chat.</p>
   {% else %}
   <strong>No bots yet</strong>
   <p>Bots can echo messages, broadcast to subscribers, or run automated tasks.</p>
@@ -96,11 +111,11 @@
 
 <!-- Create dialog -->
 <dialog id="create-dialog">
-  <h2 style="margin-bottom:20px;">New {{ 'User' if tab == 'users' else 'Bot' }}</h2>
+  <h2 style="margin-bottom:20px;">New {{ new_label }}</h2>
   <form id="create-form">
     <div class="field">
       <label>Name</label>
-      <input type="text" name="name" placeholder="{{ 'Alice' if tab == 'users' else 'My Bot' }}" required>
+      <input type="text" name="name" placeholder="{{ 'Alice' if tab == 'users' else ('Acme Inc' if tab == 'business' else 'My Bot') }}" required>
     </div>
     <div class="field">
       <label>Bio / Description <span class="muted" style="font-weight:400;">(optional)</span></label>
@@ -113,6 +128,12 @@
         <input type="file" name="avatar_file" accept="image/*" onchange="onAvatarChange(this)" style="flex:1;">
       </div>
     </div>
+    {% if tab == 'business' %}
+    <div class="field">
+      <label>Welcome Message <span class="muted" style="font-weight:400;">(optional auto-reply to new customers)</span></label>
+      <input type="text" name="welcome_message" placeholder="Thanks for reaching out! How can we help?">
+    </div>
+    {% endif %}
     {% if tab == 'bots' %}
     <div class="field">
       <label>Bot Type</label>