feat(Core): update DTOs and shared models

FinlyticCore/Models/Auth/AuthResponseDto.cs

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+using System;
+using System.Collections.Generic;
+
+namespace FinlyticCore.Models.Auth;
+
+public class AuthResponseDto
+{
+    public string Token { get; set; } = string.Empty;
+    public Guid UserId { get; set; }
+    public string Email { get; set; } = string.Empty;
+    public string FullName { get; set; } = string.Empty;
+    public string Role { get; set; } = "User";
+    public List<string> FcmTokens { get; set; } = new();
+    public DateTime ExpiresAt { get; set; }
+    public bool RequiresPasswordChange { get; set; }
+}

FinlyticCore/Models/Auth/CreateUserRequestDto.cs

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+namespace FinlyticCore.Models.Auth;
+
+public class CreateUserRequestDto
+{
+    public string Email { get; set; } = string.Empty;
+    public string Password { get; set; } = string.Empty;
+    public string FullName { get; set; } = string.Empty;
+    public string Role { get; set; } = "User"; // "User" | "Admin"
+}

FinlyticCore/Models/Auth/ITradeClient.cs

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+using System;
+using System.Threading.Tasks;
+using FinlyticCore.Models.Trades;
+
+namespace FinlyticCore.Models.Auth;
+
+/// <summary>
+/// Strongly typed SignalR client interface for real-time WebSocket/SSE streaming.
+/// </summary>
+public interface ITradeClient
+{
+    Task OnTradeProposed(TradeProposalDto proposal);
+    Task OnTradeUpdated(TradeHourlyUpdateDto update);
+    Task OnTradeClosed(string tradeId, decimal exitPrice, string reason);
+    Task OnNewsReceived(object newsItem);
+}

FinlyticCore/Models/Auth/LoginRequestDto.cs

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+namespace FinlyticCore.Models.Auth;
+
+public class LoginRequestDto
+{
+    public string Email { get; set; } = string.Empty;
+    public string Password { get; set; } = string.Empty;
+}

FinlyticCore/Models/Auth/RegisterRequestDto.cs

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+namespace FinlyticCore.Models.Auth;
+
+/// <summary>
+/// DTO representing a request for self-registration by a new user.
+/// </summary>
+public class RegisterRequestDto
+{
+    /// <summary>
+    /// User email address.
+    /// </summary>
+    public string Email { get; set; } = string.Empty;
+
+    /// <summary>
+    /// User plain-text password.
+    /// </summary>
+    public string Password { get; set; } = string.Empty;
+
+    /// <summary>
+    /// User full name.
+    /// </summary>
+    public string FullName { get; set; } = string.Empty;
+}

FinlyticCore/Models/Auth/UpdateFcmTokenRequestDto.cs

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+namespace FinlyticCore.Models.Auth;
+
+public class UpdateFcmTokenRequestDto
+{
+    public string FcmToken { get; set; } = string.Empty;
+    public string DeviceName { get; set; } = "MobileDevice";
+}

FinlyticCore/Models/Auth/UpdateUserRequestDto.cs

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+namespace FinlyticCore.Models.Auth;
+
+/// <summary>
+/// DTO for updating user role or active status by an admin.
+/// </summary>
+public class UpdateUserRequestDto
+{
+    /// <summary>
+    /// Updated user role (User, Premium, Admin).
+    /// </summary>
+    public string? Role { get; set; }
+
+    /// <summary>
+    /// Updated active state of user.
+    /// </summary>
+    public bool? IsActive { get; set; }
+
+    /// <summary>
+    /// Updated full name.
+    /// </summary>
+    public string? FullName { get; set; }
+}

FinlyticCore/Models/Auth/UserDto.cs

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+using System;
+using System.Collections.Generic;
+
+namespace FinlyticCore.Models.Auth;
+
+public class UserDto
+{
+    public Guid Id { get; set; }
+    public string Email { get; set; } = string.Empty;
+    public string FullName { get; set; } = string.Empty;
+    public string Role { get; set; } = "User";
+    public bool IsActive { get; set; } = true;
+    public List<string> FcmTokens { get; set; } = new();
+    public DateTime CreatedAt { get; set; }
+    public DateTime? LastLoginAt { get; set; }
+}