feat(studio): localise Settings sidebar + add inline help docs + Approvals doc

Three operator-UX gaps closed:

  - Settings dialog's six-category sidebar (General / Appearance /
    System AI / Integrations / Security / Maintenance) was
    hardcoded English; now flows through AppLocalizations
    ("Allgemein" / "Darstellung" / "System-KI" / "Integrationen" /
    "Sicherheit" / "Wartung"). Same for the per-panel title +
    description.
  - Per-channel daemon-action labels ('enable autostart' /
    'disable autostart' / 'daemon restart' etc.) and the
    OK / Failed result line in the toast also moved to l10n,
    so the system-action feedback reads as one language.
  - New 'Approvals' doc bundle (en + de) under assets/docs/,
    registered as a fifth doc card on Welcome plus exposed via
    the new public  helper. The
    Approvals, Audit and Doctor app-bars grow a Help icon button
    next to Refresh that opens the matching doc in the existing
    bottom-sheet reader — no extra screen, no learning curve.

Studio bumped to 0.67.0; editor path-override pulls in 0.20.1
(flow-list row polish).

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

lib/pages/audit.dart

@@ -10,6 +10,7 @@ import '../l10n/app_localizations.dart';
 import '../theme/theme.dart';
 import '../theme/tokens.dart';
 import '../widgets/widgets.dart';
+import 'welcome.dart' show showFaiDoc;
 
 class AuditPage extends StatefulWidget {
   const AuditPage({super.key});
@@ -102,6 +103,11 @@ class _AuditPageState extends State<AuditPage> {
               onChanged: (v) => setState(() => _typeFilter = v),
             ),
           ),
+          IconButton(
+            icon: const Icon(Icons.help_outline, size: 18),
+            tooltip: AppLocalizations.of(context)!.helpTooltip,
+            onPressed: () => showFaiDoc(context, 'audit'),
+          ),
           IconButton(
             icon: const Icon(Icons.delete_sweep_outlined, size: 18),
             tooltip: AppLocalizations.of(context)!.auditClearLogTooltip,