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/l10n/app_localizations_de.dart

@@ -101,6 +101,16 @@ class AppLocalizationsDe extends AppLocalizations {
   String get welcomeDocFlowsBlurb =>
       'YAML-Grundlagen, Templating-Referenz, das Extract→Summarize-Beispiel.';
 
+  @override
+  String get welcomeDocApprovalsTitle => 'Freigaben';
+
+  @override
+  String get welcomeDocApprovalsBlurb =>
+      'Human-in-the-Loop-Checkpoints — wann nutzen, wie das Audit-Log sie protokolliert.';
+
+  @override
+  String get helpTooltip => 'Hilfe';
+
   @override
   String get welcomeDocClose => 'Schließen';
 
@@ -2323,6 +2333,89 @@ class AppLocalizationsDe extends AppLocalizations {
   @override
   String get doctorPathStudioErrors => 'Studio-Fehler';
 
+  @override
+  String get settingsCategoryGeneral => 'Allgemein';
+
+  @override
+  String get settingsCategoryAppearance => 'Darstellung';
+
+  @override
+  String get settingsCategoryAi => 'System-KI';
+
+  @override
+  String get settingsCategoryIntegrations => 'Integrationen';
+
+  @override
+  String get settingsCategorySecurity => 'Sicherheit';
+
+  @override
+  String get settingsCategoryMaintenance => 'Wartung';
+
+  @override
+  String get settingsAiPanelTitle => 'System-KI';
+
+  @override
+  String get settingsAiPanelBody =>
+      'Operator-verwalteter LLM-Endpunkt, den Studio für die KI-Helfer nutzt (System-KI-Edit, Install-Vorschläge, Doctor-Zusammenfassung). Kein Flow ruft das jemals auf; Module sprechen mit ihrem eigenen LLM.';
+
+  @override
+  String get settingsIntegrationsPanelTitle => 'Integrationen';
+
+  @override
+  String get settingsIntegrationsPanelBody =>
+      'Externe Tool-Server, deren Capabilities der Hub föderiert. MCP-Server bieten Tool-Endpunkte; n8n-Endpunkte stellen gehostete Workflows bereit.';
+
+  @override
+  String get settingsSecurityPanelTitle => 'Sicherheit & Zugangsdaten';
+
+  @override
+  String get settingsSecurityPanelBody =>
+      'Tokens, die der Hub für dich verwahrt. Liegen in ~/.fai/ mit Modus 0600; werden nie als Telemetrie versendet.';
+
+  @override
+  String get settingsMaintenancePanelTitle => 'Wartung';
+
+  @override
+  String get settingsMaintenancePanelBody =>
+      'Destruktive Aktionen, abgesichert durch explizite Bestätigungs-Dialoge. Nutzen z.B. beim Re-Pilot-Testen oder Debuggen.';
+
+  @override
+  String get tooltipMoveUp => 'Nach oben';
+
+  @override
+  String get tooltipMoveDown => 'Nach unten';
+
+  @override
+  String get tooltipRemove => 'Entfernen';
+
+  @override
+  String get daemonActionEnableAutostart => 'Autostart aktivieren';
+
+  @override
+  String get daemonActionDisableAutostart => 'Autostart deaktivieren';
+
+  @override
+  String get daemonActionRestart => 'Daemon neu starten';
+
+  @override
+  String get daemonActionStart => 'Daemon starten';
+
+  @override
+  String get daemonActionStop => 'Daemon stoppen';
+
+  @override
+  String get daemonActionStatus => 'Daemon-Status';
+
+  @override
+  String daemonActionResultOk(String label) {
+    return 'OK · $label';
+  }
+
+  @override
+  String daemonActionResultFailed(String label) {
+    return 'Fehlgeschlagen · $label';
+  }
+
   @override
   String get addSourceTitle => 'Modul-Quelle hinzufügen';