feat(studio): hub maintenance panel with reset action (v0.45.0)

UI parity with the platform CLI: `fai reset` (v0.10.93) is now
reachable from Settings. The panel shows the reset blurb plus
two checkboxes mirroring the CLI flags (Keep modules / Keep
audit log + saved flows), then a destructive-styled "Reset hub
state" button. Click goes through a confirm dialog before
SystemActions.faiReset is invoked.

After the CLI returns, Studio bounces its gRPC channel against
the same endpoint (the daemon restarts on the same channel +
port, so no Settings change needed) and reloads every panel:
channel status, system AI, MCP clients, n8n endpoints, registry
token. Output (success or failure) is shown in a copyable error
box so any unexpected stderr lands somewhere the operator can
paste from.

Sits at the bottom of the dialog under "HUB MAINTENANCE",
separated from the everyday config so a destructive button
doesn't crowd the day-to-day controls.

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

lib/l10n/app_localizations.dart

@@ -2042,6 +2042,72 @@ abstract class AppLocalizations {
   /// **'Could not save: {error}'**
   String registryTokenSaveFailedToast(String error);
 
+  /// No description provided for @maintenanceHeader.
+  ///
+  /// In en, this message translates to:
+  /// **'HUB MAINTENANCE'**
+  String get maintenanceHeader;
+
+  /// No description provided for @maintenanceResetBlurb.
+  ///
+  /// In en, this message translates to:
+  /// **'Wipe operator state and start over with a clean hub. Stops every running daemon, atomically backs ~/.fai/ up, then recreates it with the binary, channel state, MCP / n8n / system-AI config, and registry token preserved. Restore by moving the backup directory back.'**
+  String get maintenanceResetBlurb;
+
+  /// No description provided for @maintenanceKeepModulesTitle.
+  ///
+  /// In en, this message translates to:
+  /// **'Keep installed modules'**
+  String get maintenanceKeepModulesTitle;
+
+  /// No description provided for @maintenanceKeepModulesSubtitle.
+  ///
+  /// In en, this message translates to:
+  /// **'Default behaviour wipes ~/.fai/modules/ so a fresh install can verify the module-fetch path end-to-end.'**
+  String get maintenanceKeepModulesSubtitle;
+
+  /// No description provided for @maintenanceKeepDataTitle.
+  ///
+  /// In en, this message translates to:
+  /// **'Keep audit log + saved flows'**
+  String get maintenanceKeepDataTitle;
+
+  /// No description provided for @maintenanceKeepDataSubtitle.
+  ///
+  /// In en, this message translates to:
+  /// **'Default behaviour wipes ~/.fai/data/ so the audit chain restarts from a fresh genesis and the bundled sample flows re-import on first daemon start.'**
+  String get maintenanceKeepDataSubtitle;
+
+  /// No description provided for @maintenanceResetButton.
+  ///
+  /// In en, this message translates to:
+  /// **'Reset hub state'**
+  String get maintenanceResetButton;
+
+  /// No description provided for @maintenanceResetInProgress.
+  ///
+  /// In en, this message translates to:
+  /// **'Resetting…'**
+  String get maintenanceResetInProgress;
+
+  /// No description provided for @maintenanceResetConfirmTitle.
+  ///
+  /// In en, this message translates to:
+  /// **'Reset hub state?'**
+  String get maintenanceResetConfirmTitle;
+
+  /// No description provided for @maintenanceResetConfirmBody.
+  ///
+  /// In en, this message translates to:
+  /// **'This stops every daemon, moves ~/.fai/ to a timestamped backup, and starts fresh. The backup is fully restorable. Continue?'**
+  String get maintenanceResetConfirmBody;
+
+  /// No description provided for @maintenanceResetConfirmButton.
+  ///
+  /// In en, this message translates to:
+  /// **'Reset'**
+  String get maintenanceResetConfirmButton;
+
   /// No description provided for @welcomeChecklistAllSetTitle.
   ///
   /// In en, this message translates to: