Enhance user management and node health check features

- Updated `ListUsersQueryHandler` to include plan names and config quotas in `UserSummaryDto`, enriching user data retrieval.
- Implemented `WithPlanNamesAsync` method to fetch plan names based on user plan IDs, improving user experience in the admin interface.
- Enhanced `Node` class with a `ConsecutiveProbeFailures` property for better status management during health checks.
- Modified `NodeHealthCheckService` to utilize the new `RecordProbe` method, implementing a hysteresis mechanism for node status changes.
- Updated frontend components to display user config quotas and plan names, improving clarity in user management.
- Enhanced tests for user listing and node status handling to ensure robust functionality and coverage.
- Updated documentation to reflect changes in user and node management features.

frontend/src/routes/admin/users.tsx

@@ -130,6 +130,7 @@ function AdminUsersPage() {
                 <th className="py-2 font-medium">{t('admin.users.userName')}</th>
                 <th className="py-2 font-medium">{t('admin.users.role')}</th>
                 <th className="py-2 font-medium">{t('admin.users.statusLabel')}</th>
+                <th className="py-2 font-medium">{t('admin.users.configQuota')}</th>
                 <th className="py-2 font-medium">{t('admin.users.billingLabel')}</th>
                 <th className="py-2" />
               </tr>
@@ -148,6 +149,14 @@ function AdminUsersPage() {
                           : t('admin.users.status.pending')}
                     </Badge>
                   </td>
+                  <td className="py-2">
+                    <span>{user.configQuota === -1 ? '∞' : user.configQuota}</span>
+                    <span className="ml-1 text-xs text-muted-foreground">
+                      {user.configQuota === -1
+                        ? t('admin.users.unlimitedQuota')
+                        : (user.planName ?? t('admin.users.customQuota'))}
+                    </span>
+                  </td>
                   <td className="py-2">
                     {user.billingEnabled ? (
                       <PaidUntilBadge