Initial commit: base slice (auth, roles, users, admin) scaffold

Backend: .NET 10 Clean Architecture + LiteCqrs.Net + EF Core/PostgreSQL +
Identity/JWT. Frontend: React 19 + Vite + TanStack Query/Router + Tailwind v4
with a retro CRT theme. Docker/compose deployment mirroring PnvPanel's
conventions, scoped down to the current base feature set.

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

@@ -0,0 +1,62 @@
+using TeleWave.Application.Common.Models;
+
+namespace TeleWave.Application.Common.Interfaces;
+
+public sealed record CurrentUserProfile(Guid Id, string UserName, Guid RoleId, string Role, bool IsBlocked);
+
+public sealed record UserSummaryDto(
+    Guid Id,
+    string UserName,
+    string Role,
+    bool IsBlocked,
+    DateTimeOffset CreatedAt
+);
+
+public interface IIdentityService
+{
+    /// <summary>Создаёт пользователя и назначает роль по умолчанию (см. Infrastructure/Identity/RoleNames).</summary>
+    Task<Result<Guid>> CreateUserAsync(
+        string userName,
+        string password,
+        CancellationToken cancellationToken
+    );
+
+    Task<Result<AuthenticatedUser>> ValidateCredentialsAsync(
+        string userName,
+        string password,
+        CancellationToken cancellationToken
+    );
+
+    Task<CurrentUserProfile?> GetProfileAsync(Guid userId, CancellationToken cancellationToken);
+
+    Task<Result> ChangePasswordAsync(
+        Guid userId,
+        string currentPassword,
+        string newPassword,
+        CancellationToken cancellationToken
+    );
+
+    Task<Result> ChangeUserNameAsync(
+        Guid userId,
+        string newUserName,
+        CancellationToken cancellationToken
+    );
+
+    /// <summary>Удаляет аккаунт (самоудаление или удаление админом).</summary>
+    Task<Result> DeleteUserAsync(Guid userId, CancellationToken cancellationToken);
+
+    Task<Result> BlockUserAsync(Guid userId, CancellationToken cancellationToken);
+
+    Task<Result> UnblockUserAsync(Guid userId, CancellationToken cancellationToken);
+
+    Task<PagedList<UserSummaryDto>> ListUsersAsync(
+        int page,
+        int pageSize,
+        string? search,
+        Guid? roleId,
+        bool? isBlocked,
+        CancellationToken cancellationToken
+    );
+
+    Task<UserSummaryDto?> GetUserAsync(Guid userId, CancellationToken cancellationToken);
+}