Redirect the other www spelling to SITE_ORIGIN, hold roles to the role help and fix the audit findings

SITE_ORIGIN alone decides whether the site is www or not: CanonicalHostSubscriber
sends the other spelling there with 301, cms:site:origin writes the setting, the
system screen shows it. The roles now match the role help (editor: drafts,
publisher: live content, admin: design, settings, users, system). The installer no
longer reopens on an unreachable database, the session cookie follows ADMIN_PATH,
percent-encoded credentials no longer break the container, consent only accepts
same-site decisions, JSON-LD is HTML-safe, own CSS stays in its block, plus the
editor, updater, download and public-output findings from the full review
(ADR 099, ADR 100).

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

templates/page.html.twig

@@ -60,7 +60,7 @@
        show the layout, not run code that could change the page under the editor's hands. #}
     {% if pageScript|default(null) and not editing|default(false) %}<script src="{{ pageScript }}" defer></script>{% endif %}
     {# A data block, not a script: CSP script-src does not apply to application/ld+json. #}
-    {% for block in structuredData|default([]) %}<script type="application/ld+json">{{ block|json_encode(constant('JSON_UNESCAPED_SLASHES') b-or constant('JSON_UNESCAPED_UNICODE'))|raw }}</script>
+    {% for block in structuredData|default([]) %}<script type="application/ld+json">{{ block|json_encode(constant('JSON_UNESCAPED_SLASHES') b-or constant('JSON_UNESCAPED_UNICODE') b-or constant('JSON_HEX_TAG') b-or constant('JSON_HEX_AMP'))|raw }}</script>
     {% endfor %}
     {% if pageStyles|default('') %}
         {# In the editor the preview inherits the administration's policy, which forbids inline