feat(Backend): update API gateway and websocket hubs

FinlyticBackend/Entities/ServiceConfigurationEntity.cs

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+using System;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace FinlyticBackend.Entities;
+
+/// <summary>
+/// Persisted service configuration setting stored in PostgreSQL.
+/// </summary>
+[Table("service_configurations")]
+public class ServiceConfigurationEntity
+{
+    [Key]
+    [Column("id")]
+    public Guid Id { get; set; } = Guid.NewGuid();
+
+    [Required]
+    [MaxLength(100)]
+    [Column("service_name")]
+    public string ServiceName { get; set; } = string.Empty;
+
+    [Required]
+    [MaxLength(100)]
+    [Column("config_key")]
+    public string ConfigKey { get; set; } = string.Empty;
+
+    [Required]
+    [Column("config_value")]
+    public string ConfigValue { get; set; } = string.Empty;
+
+    [MaxLength(50)]
+    [Column("data_type")]
+    public string DataType { get; set; } = "string"; // string, int, double, boolean, json
+
+    [MaxLength(255)]
+    [Column("description")]
+    public string Description { get; set; } = string.Empty;
+
+    [Column("updated_at")]
+    public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
+}

FinlyticBackend/Entities/UserDeviceTokenEntity.cs

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+using System;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace FinlyticBackend.Entities;
+
+[Table("user_device_tokens")]
+public class UserDeviceTokenEntity
+{
+    [Key]
+    public Guid Id { get; set; } = Guid.NewGuid();
+
+    [Required]
+    public Guid UserId { get; set; }
+
+    [ForeignKey(nameof(UserId))]
+    public UserEntity? User { get; set; }
+
+    [Required]
+    [MaxLength(500)]
+    public string FcmToken { get; set; } = string.Empty;
+
+    [MaxLength(100)]
+    public string DeviceName { get; set; } = "MobileDevice";
+
+    public DateTime RegisteredAt { get; set; } = DateTime.UtcNow;
+    public DateTime LastUsedAt { get; set; } = DateTime.UtcNow;
+}

FinlyticBackend/Entities/UserEntity.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace FinlyticBackend.Entities;
+
+[Table("users")]
+public class UserEntity
+{
+    [Key]
+    public Guid Id { get; set; } = Guid.NewGuid();
+
+    [Required]
+    [MaxLength(150)]
+    public string Email { get; set; } = string.Empty;
+
+    [Required]
+    public string PasswordHash { get; set; } = string.Empty;
+
+    [MaxLength(100)]
+    public string FullName { get; set; } = string.Empty;
+
+    [Required]
+    [MaxLength(30)]
+    public string Role { get; set; } = "User"; // "Admin" | "User"
+
+    public bool IsActive { get; set; } = true;
+    
+    public bool RequiresPasswordChange { get; set; } = false;
+
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public DateTime? LastLoginAt { get; set; }
+
+    [MaxLength(50)]
+    public string ThemePreference { get; set; } = "dark_classic";
+
+    public List<UserDeviceTokenEntity> DeviceTokens { get; set; } = new();
+}

FinlyticBackend/Entities/UserFavoriteAssetEntity.cs

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+using System;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace FinlyticBackend.Entities;
+
+[Table("user_favorite_assets")]
+public class UserFavoriteAssetEntity
+{
+    [Key]
+    public Guid Id { get; set; } = Guid.NewGuid();
+
+    [Required]
+    public Guid UserId { get; set; }
+
+    [ForeignKey(nameof(UserId))]
+    public UserEntity? User { get; set; }
+
+    [Required]
+    [MaxLength(30)]
+    public string Isin { get; set; } = string.Empty;
+
+    [MaxLength(50)]
+    public string? SelectedTicker { get; set; }
+
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+}