Enhance user plan management and update related endpoints

- Added new configuration options for user plans in `.env.example`, including `Plans__MaxCustomConfigCount` and `Plans__MinCustomConfigCount`.
- Introduced `MapPlanEndpoints` in `Program.cs` to handle plan-related API routes.
- Implemented `SetUserPlan` endpoint in `RoleEndpoints` to allow admins to assign plans to users.
- Removed deprecated role request approval endpoints from `AdminSupportEndpoints`.
- Updated `ITelegramNotifier` and related classes to reflect changes in role request handling and payment notifications.
- Refactored role management commands to remove `MaxConfigs` and focus on `MaxIpLimit` and billing settings.
- Enhanced billing request handling to accommodate plan changes instead of role changes.
- Updated various interfaces and command handlers to support new plan management features.

backend/src/PnvPanel.Api/Telegram/PnvBotUpdateHandler.cs

@@ -440,55 +440,6 @@ public sealed class PnvBotUpdateHandler(
 
                 break;
             }
-            case "rrq":
-            {
-                if (!await TrySetAdminCurrentUserAsync(services, fromId, cancellationToken))
-                {
-                    await botClient.AnswerCallbackQuery(
-                        callback.Id,
-                        "Недостаточно прав.",
-                        cancellationToken: cancellationToken
-                    );
-                    return;
-                }
-
-                var result =
-                    parts[1] == "approve"
-                        ? await sender.Send(
-                            new ApproveRoleRequestCommand(requestId),
-                            cancellationToken
-                        )
-                        : await sender.Send(
-                            new RejectRoleRequestCommand(requestId, Reason: null),
-                            cancellationToken
-                        );
-
-                await botClient.AnswerCallbackQuery(
-                    callback.Id,
-                    result.IsSuccess ? "Готово" : result.Error.Message,
-                    cancellationToken: cancellationToken
-                );
-                if (callback.Message is not null)
-                {
-                    var statusText = result.IsSuccess
-                        ? (
-                            parts[1] == "approve"
-                                ? "✅ Заявка одобрена, роль выдана."
-                                : "❌ Заявка отклонена."
-                        )
-                        : $"⚠️ {result.Error.Message}";
-                    var text = $"{Escape(callback.Message.Text ?? "")}\n\n{statusText}";
-                    await botClient.EditMessageText(
-                        chatId.Value,
-                        callback.Message.Id,
-                        text,
-                        parseMode: ParseMode.Html,
-                        cancellationToken: cancellationToken
-                    );
-                }
-
-                break;
-            }
             case "erq":
             {
                 if (!await TrySetAdminCurrentUserAsync(services, fromId, cancellationToken))