Force HTTPS from the admin, with a probe before and after

System > HTTPS and cms:https switch the redirect lines in public/.htaccess
only when the site answers over HTTPS, and take them back on a loop. HSTS
is a separate second switch. The redirect block moves before the front
controller rules, where it never reached pages, and .well-known is no
longer denied, so the origin probe works on Apache. The Git updater keeps
switched-on lines like the archive update.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/Controller/SystemController.php

@@ -9,6 +9,7 @@ use App\Domain\InvalidPage;
 use App\Ops\ArchiveUpdate;
 use App\Ops\Backup;
 use App\Ops\Environment;
+use App\Ops\HttpsRedirect;
 use App\Ops\Installation;
 use App\Ops\OriginCheck;
 use App\Ops\SitePackage;
@@ -29,7 +30,7 @@ use Symfony\Component\Routing\Attribute\Route;
  */
 final class SystemController extends AbstractController
 {
-    public function __construct(private Updater $updater, private Backup $backup, private ArchiveUpdate $archive, private Installation $installation, private string $adminPath, private string $databaseUrl, private string $mediaDirectory, private string $projectDir, private string $siteOrigin, private OriginCheck $originCheck, private HttpKernelInterface $kernel, private PageRepository $pages, private SiteSettings $settings, private SitePackage $packages)
+    public function __construct(private Updater $updater, private Backup $backup, private ArchiveUpdate $archive, private Installation $installation, private string $adminPath, private string $databaseUrl, private string $mediaDirectory, private string $projectDir, private string $siteOrigin, private OriginCheck $originCheck, private HttpKernelInterface $kernel, private PageRepository $pages, private SiteSettings $settings, private SitePackage $packages, private HttpsRedirect $https)
     {
     }
 
@@ -67,6 +68,9 @@ final class SystemController extends AbstractController
             // bekommt hier den Hinweis, dass die Website woanders eingetragen ist.
             'origin' => $this->originFacts($request),
             'originRejected' => $request->getSession()->remove('origin_rejected'),
+            // HTTPS erzwingen und HSTS (ADR 120): der Stand in public/.htaccess.
+            'https' => $this->https->state(),
+            'secure' => $request->isSecure(),
         ]);
     }
 
@@ -494,6 +498,28 @@ final class SystemController extends AbstractController
         ), 'success');
     }
 
+    /**
+     * HTTPS erzwingen oder HSTS schalten (ADR 120). Die Umleitung wird nur eingeschaltet, wenn
+     * HTTPS vorher und nachher hier ankommt; sonst bleibt public/.htaccess, wie sie war.
+     */
+    #[Route('/%kant.admin_path%/system/https', name: 'admin_system_https', methods: ['POST'])]
+    public function https(Request $request): Response
+    {
+        $this->denyAccessUnlessGranted('ROLE_ADMIN');
+        if (!$this->isCsrfTokenValid('system', $request->request->getString('_csrf_token'))) {
+            return $this->back('Deine Sitzung ist abgelaufen. Bitte melde dich erneut an.');
+        }
+        $result = match ($request->request->getString('action')) {
+            'redirect-an' => $this->https->enableRedirect($this->siteOrigin),
+            'redirect-aus' => $this->https->disableRedirect(),
+            'hsts-an' => $this->https->switchHsts(true, $this->siteOrigin),
+            'hsts-aus' => $this->https->switchHsts(false, $this->siteOrigin),
+            default => ['ok' => false, 'message' => 'Unbekannte Aktion.'],
+        };
+
+        return $this->back($result['message'], $result['ok'] ? 'success' : 'error');
+    }
+
     /** Die Gegenstelle zur Prüfung oben: öffentlich, und sie verrät nichts als diese Kennung. */
     #[Route(OriginCheck::PATH, name: 'site_origin_probe', methods: ['GET'], priority: 10)]
     public function originProbe(): Response