Implement role and user management enhancements

- Added MaxIpLimit to roles, allowing for the configuration of simultaneous IP limits for users.
- Updated role creation and update commands to include MaxIpLimit, ensuring proper handling in the application logic.
- Enhanced user management by introducing a DELETE endpoint for user accounts, with appropriate checks to prevent self-deletion.
- Updated documentation to reflect changes in role and user management, clarifying the new IP limit functionality and user deletion process.
- Adjusted related tests to cover new functionality and ensure robust validation of role and user management features.

backend/src/PnvPanel.Application/Common/Interfaces/IIdentityService.cs

@@ -5,7 +5,8 @@ namespace PnvPanel.Application.Common.Interfaces;
 public sealed record AuthenticatedUser(Guid Id, string UserName, string Role);
 
 public sealed record CurrentUserProfile(
-    Guid Id, string UserName, Guid RoleId, string Role, bool IsActivated, bool IsBlocked, int MaxConfigs, string SubscriptionToken);
+    Guid Id, string UserName, Guid RoleId, string Role, bool IsActivated, bool IsBlocked, int MaxConfigs, int MaxIpLimit,
+    string SubscriptionToken);
 
 public sealed record UserSummaryDto(Guid Id, string UserName, string Role, bool IsActivated, bool IsBlocked, DateTimeOffset? ActivatedAt);
 

backend/src/PnvPanel.Application/Common/Interfaces/IRoleService.cs

@@ -2,13 +2,13 @@ using PnvPanel.Application.Common.Models;
 
 namespace PnvPanel.Application.Common.Interfaces;
 
-public sealed record RoleDto(Guid Id, string Name, int MaxConfigs, bool IsSystem);
+public sealed record RoleDto(Guid Id, string Name, int MaxConfigs, int MaxIpLimit, bool IsSystem);
 
 public interface IRoleService
 {
-    Task<Result<RoleDto>> CreateRoleAsync(string name, int maxConfigs, CancellationToken cancellationToken);
+    Task<Result<RoleDto>> CreateRoleAsync(string name, int maxConfigs, int maxIpLimit, CancellationToken cancellationToken);
 
-    Task<Result<RoleDto>> UpdateRoleAsync(Guid roleId, int maxConfigs, CancellationToken cancellationToken);
+    Task<Result<RoleDto>> UpdateRoleAsync(Guid roleId, int maxConfigs, int maxIpLimit, CancellationToken cancellationToken);
 
     Task<Result> DeleteRoleAsync(Guid roleId, CancellationToken cancellationToken);
 

backend/src/PnvPanel.Application/Common/Interfaces/IXuiPanelGateway.cs

@@ -24,9 +24,13 @@ public interface IXuiPanelGateway
 
     void InvalidateClient(Guid nodeId);
 
-    /// <summary>Возвращает ClientExternalId, присвоенный панелью (UUID для VLESS/VMess, пароль для Trojan/Shadowsocks).</summary>
+    /// <summary>
+    /// Возвращает ClientExternalId, присвоенный панелью (UUID для VLESS/VMess, пароль для Trojan/Shadowsocks).
+    /// <paramref name="limitIp"/> — лимит одновременных IP клиента (квота роли, см. AppRole.MaxIpLimit);
+    /// -1 (RoleQuota.Unlimited) означает без лимита — гейтвей сам переводит его в нативное значение 3x-ui.
+    /// </summary>
     Task<Result<string>> AddClientAsync(
-        Node node, string inboundRemoteId, VpnProtocol protocol, string clientEmail, string clientName,
+        Node node, string inboundRemoteId, VpnProtocol protocol, string clientEmail, string clientName, int limitIp,
         CancellationToken cancellationToken);
 
     Task<Result> RemoveClientAsync(