Enhance admin maintenance functionality with new endpoints and response types

- Added new DELETE endpoints for managing audit logs and disabled apps in the admin maintenance section.
- Updated existing endpoint for closed tickets to use a unified response type, `MaintenanceCleanupResponseDto`.
- Enhanced API documentation to reflect the new operations and their expected request/response formats.
- Improved frontend integration with new functions for deleting old audit logs and disabled apps, including user confirmation prompts.
- Added localization support for new maintenance actions in both Russian and English.

backend/src/PnvPanel.Application/Admin/Maintenance/DeleteClosedTicketsCommandHandler.cs

@@ -59,7 +59,7 @@ public sealed class DeleteClosedTicketsCommandHandler(
                 "ClosedTicketsCleanedUp",
                 "SupportTicket",
                 "bulk",
-                metadata: $"count={ticketIds.Count}",
+                metadata: $"{{\"count\":{ticketIds.Count}}}",
                 AuditSource.Web
             )
         );

backend/src/PnvPanel.Application/Admin/Maintenance/DeleteDisabledAppsCommand.cs

@@ -0,0 +1,7 @@
+using PnvPanel.Application.Common.Messaging;
+using PnvPanel.Application.Common.Models;
+
+namespace PnvPanel.Application.Admin.Maintenance;
+
+/// <summary>Удаляет все ClientApp с IsEnabled = false. Value — число удалённых записей.</summary>
+public sealed record DeleteDisabledAppsCommand : ICommand<Result<int>>;

backend/src/PnvPanel.Application/Admin/Maintenance/DeleteDisabledAppsCommandHandler.cs

@@ -0,0 +1,45 @@
+using Microsoft.EntityFrameworkCore;
+using PnvPanel.Application.Auth;
+using PnvPanel.Application.Common.Interfaces;
+using PnvPanel.Application.Common.Messaging;
+using PnvPanel.Application.Common.Models;
+using PnvPanel.Domain.Audit;
+
+namespace PnvPanel.Application.Admin.Maintenance;
+
+public sealed class DeleteDisabledAppsCommandHandler(
+    IAppDbContext dbContext,
+    ICurrentUser currentUser
+) : ICommandHandler<DeleteDisabledAppsCommand, Result<int>>
+{
+    public async Task<Result<int>> Handle(
+        DeleteDisabledAppsCommand command,
+        CancellationToken cancellationToken
+    )
+    {
+        if (currentUser.UserId is not { } adminId)
+            return Result.Failure<int>(AuthErrors.Unauthorized);
+
+        var apps = await dbContext
+            .ClientApps.Where(a => !a.IsEnabled)
+            .ToListAsync(cancellationToken);
+
+        if (apps.Count == 0)
+            return Result.Success(0);
+
+        dbContext.ClientApps.RemoveRange(apps);
+
+        dbContext.AuditLogs.Add(
+            AuditLog.Create(
+                adminId,
+                "DisabledAppsCleanedUp",
+                "ClientApp",
+                "bulk",
+                metadata: $"{{\"count\":{apps.Count}}}",
+                AuditSource.Web
+            )
+        );
+
+        return Result.Success(apps.Count);
+    }
+}

backend/src/PnvPanel.Application/Admin/Maintenance/DeleteOldAuditLogsCommand.cs

@@ -0,0 +1,7 @@
+using PnvPanel.Application.Common.Messaging;
+using PnvPanel.Application.Common.Models;
+
+namespace PnvPanel.Application.Admin.Maintenance;
+
+/// <summary>Удаляет записи AuditLog старше OlderThanDays дней. Value — число удалённых записей.</summary>
+public sealed record DeleteOldAuditLogsCommand(int OlderThanDays) : ICommand<Result<int>>;

backend/src/PnvPanel.Application/Admin/Maintenance/DeleteOldAuditLogsCommandHandler.cs

@@ -0,0 +1,49 @@
+using Microsoft.EntityFrameworkCore;
+using PnvPanel.Application.Auth;
+using PnvPanel.Application.Common.Interfaces;
+using PnvPanel.Application.Common.Messaging;
+using PnvPanel.Application.Common.Models;
+using PnvPanel.Domain.Audit;
+
+namespace PnvPanel.Application.Admin.Maintenance;
+
+public sealed class DeleteOldAuditLogsCommandHandler(
+    IAppDbContext dbContext,
+    ICurrentUser currentUser
+) : ICommandHandler<DeleteOldAuditLogsCommand, Result<int>>
+{
+    public async Task<Result<int>> Handle(
+        DeleteOldAuditLogsCommand command,
+        CancellationToken cancellationToken
+    )
+    {
+        if (currentUser.UserId is not { } adminId)
+            return Result.Failure<int>(AuthErrors.Unauthorized);
+
+        var threshold = DateTimeOffset.UtcNow.AddDays(-command.OlderThanDays);
+
+        var logs = await dbContext
+            .AuditLogs.Where(l => l.CreatedAt < threshold)
+            .ToListAsync(cancellationToken);
+
+        if (logs.Count == 0)
+            return Result.Success(0);
+
+        dbContext.AuditLogs.RemoveRange(logs);
+
+        // Новая запись создаётся уже после выборки старых — её CreatedAt = UtcNow не попадает
+        // под тот же порог и не удаляется этой же операцией.
+        dbContext.AuditLogs.Add(
+            AuditLog.Create(
+                adminId,
+                "AuditLogsCleanedUp",
+                "AuditLog",
+                "bulk",
+                metadata: $"{{\"count\":{logs.Count},\"olderThanDays\":{command.OlderThanDays}}}",
+                AuditSource.Web
+            )
+        );
+
+        return Result.Success(logs.Count);
+    }
+}

backend/src/PnvPanel.Application/Admin/Maintenance/DeleteOldAuditLogsCommandValidator.cs

@@ -0,0 +1,12 @@
+using FluentValidation;
+
+namespace PnvPanel.Application.Admin.Maintenance;
+
+public sealed class DeleteOldAuditLogsCommandValidator
+    : AbstractValidator<DeleteOldAuditLogsCommand>
+{
+    public DeleteOldAuditLogsCommandValidator()
+    {
+        RuleFor(x => x.OlderThanDays).GreaterThanOrEqualTo(1).LessThanOrEqualTo(3650);
+    }
+}