Add Telegram bot integration and enhance user management features

- Introduced Telegram.Bot package for bot functionality.
- Updated user management to include Telegram linking and blocking features.
- Enhanced activation request handling with notifications via Telegram.
- Added new database entities for Telegram link tokens and login requests.
- Implemented traffic synchronization for client stats in the XuiPanelGateway.
- Updated application structure to support new test projects and improved dependency injection for Telegram services.

backend/src/PnvPanel.Api/Endpoints/AdminStatsEndpoints.cs

@@ -0,0 +1,35 @@
+using PnvPanel.Api.Common;
+using PnvPanel.Application.Admin.Audit;
+using PnvPanel.Application.Admin.Stats;
+using PnvPanel.Application.Common.Messaging;
+using PnvPanel.Infrastructure.Identity;
+
+namespace PnvPanel.Api.Endpoints;
+
+public static class AdminStatsEndpoints
+{
+    public static IEndpointRouteBuilder MapAdminStatsEndpoints(this IEndpointRouteBuilder app)
+    {
+        var admin = app.MapGroup("/api/admin")
+            .WithTags("Admin.Stats")
+            .RequireAuthorization(policy => policy.RequireRole(RoleNames.Admin));
+
+        admin.MapGet("/stats", GetStats);
+        admin.MapGet("/audit", GetAudit);
+
+        return app;
+    }
+
+    private static async Task<IResult> GetStats(ISender sender, CancellationToken cancellationToken)
+    {
+        var result = await sender.Send(new GetStatsQuery(), cancellationToken);
+        return result.ToHttpResult();
+    }
+
+    private static async Task<IResult> GetAudit(int page, int pageSize, ISender sender, CancellationToken cancellationToken)
+    {
+        var query = new ListAuditLogsQuery(page <= 0 ? 1 : page, pageSize <= 0 ? 50 : pageSize);
+        var result = await sender.Send(query, cancellationToken);
+        return result.ToHttpResult();
+    }
+}