fix(qa): health monitor SiteManager, WP plugins, favicon, download ZIPs

- Health monitor now uses SiteManager for complete site discovery
- SEO Bridge: GPLv2+ license, Tested up to 6.9, fix escaping
- OpenPanel: fix wp_unslash, reduce tags, update branding
- Add logo.svg favicon, static file serving, plugin ZIPs

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

core/templates/base.html

@@ -4,6 +4,7 @@
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>{% block title %}MCP Hub{% endblock %}</title>
+    <link rel="icon" type="image/svg+xml" href="/static/logo.svg">
 
     <!-- Tailwind CSS from CDN -->
     <script src="https://cdn.tailwindcss.com"></script>