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/admin/system.html.twig

@@ -34,6 +34,16 @@
                 {% endif %}
                 <br><span class="muted">Eingestellt in <code>{{ database.quelle }}</code>; Server-Umgebungsvariablen haben Vorrang.</span>
             </dd>
+            <dt>Adresse</dt>
+            <dd>
+                {% if origin.adresse %}<code>{{ origin.adresse }}</code>{% else %}<span class="check-bad"><strong>Nicht eingetragen.</strong></span>{% endif %}
+                {% if origin.passt %}
+                <span class="muted">– Canonical, Sitemap und Feed nennen sie; die Schreibweise {{ origin.adresse matches '{^https?://www\.}' ? 'ohne' : 'mit' }} www leitet hierher um.</span>
+                {% else %}
+                <br><span class="check-bad"><strong>Diese Verwaltung läuft gerade unter <code>{{ origin.host }}</code>.</strong> Canonical, Sitemap und Feed nennen trotzdem die eingetragene Adresse. Stimmt die nicht mehr: <code>php bin/console cms:site:origin https://…</code> oder <code>SITE_ORIGIN</code> in <code>.env</code> ändern.</span>
+                {% endif %}
+                <br><span class="muted">Eingestellt in <code>{{ origin.quelle }}</code>; Server-Umgebungsvariablen haben Vorrang.</span>
+            </dd>
             {% if state.worktree %}
             <dt>Stand</dt><dd><code>{{ state.describe }}</code>{% if state.commit != 'unbekannt' %} · Commit <code>{{ state.commit }}</code>{% endif %}</dd>
             {% else %}