Refactor Profile entity and update property constraints

Renamed `Profile` to `CfgProfile` across the codebase for clarity and consistency. Updated property constraints in `CfgProfile.cs`, `ProfileHistory.cs`, and `ProfileSqlJob.cs` to include maximum length validations. Changed navigation properties in `CfgProfile.cs` to use `IEnumerable` and made them nullable. Updated `ForeignKey` attributes in `ProfileHistory.cs` and `ProfileSqlJob.cs` to reference `CfgProfile`. Improved property descriptions for better documentation.

ECMJobRunner.Domain/Entities/ProfileHistory.cs

@@ -25,7 +25,7 @@ namespace ECMJobRunner.Domain.Entities
         /// </summary>
         [Required]
         [Column("FK_TBJR_CFG_PROFILE_ID")]
-        [ForeignKey(nameof(Profile))]
+        [ForeignKey(nameof(CfgProfile))]
         public long ProfileId { get; set; }
 
         /// <summary>
@@ -43,7 +43,7 @@ namespace ECMJobRunner.Domain.Entities
         public string ResultText { get; set; } = string.Empty;
 
         /// <summary>
-        /// Created by
+        /// Created by (max 50 chars)
         /// </summary>
         [Required]
         [Column("ADDED_WHO")]
@@ -58,7 +58,7 @@ namespace ECMJobRunner.Domain.Entities
         public DateTime AddedWhen { get; set; } = DateTime.Now;
 
         /// <summary>
-        /// Modified by
+        /// Modified by (max 50 chars)
         /// </summary>
         [Column("CHANGED_WHO")]
         [MaxLength(50)]
@@ -75,6 +75,6 @@ namespace ECMJobRunner.Domain.Entities
         /// <summary>
         /// Associated Profile
         /// </summary>
-        public virtual Profile Profile { get; set; } = null!;
+        public virtual CfgProfile? CfgProfile { get; set; }
     }
 }