brand: add (you)r* prefix to landing page title

Reinforces the r-suite "your tools" philosophy across all rApp landing pages.
Also normalizes title separators to em-dash for consistency.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

portal/templates/portal/base.html

@@ -10,7 +10,7 @@
     {% load static %}
     <link rel="icon" href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><text y='.9em' font-size='90'>📁</text></svg>">
     <link rel="apple-touch-icon" href="{% static 'portal/icon-192.png' %}">
-    <title>{% block title %}Upload{% endblock %} - rfiles.online</title>
+    <title>{% block title %}Upload{% endblock %} - (you)rFiles</title>
     <style>
         :root {
             --bg: #0a0a0a;