Converted CalculateLevel to extension method

Removed `PlayerService`

Libraries/SPTarkov.Server.Core/Extensions/ProfileExtensions.cs

@@ -171,5 +171,34 @@ namespace SPTarkov.Server.Core.Extensions
                     b.BanType == BanType.RagFair && currentTimestamp < b.DateTime
                 ) ?? false;
         }
+
+        /// <summary>
+        ///     Calculates the current level of a player based on their accumulated experience points.
+        ///     This method iterates through an experience table to determine the highest level achieved
+        ///     by comparing the player's experience against cumulative thresholds.
+        /// </summary>
+        /// <param name="pmcData"> Player profile </param>
+        /// <param name="expTable">Experience table from globals.json</param>
+        /// <returns>
+        ///     The calculated level of the player as an integer, or null if the level cannot be determined.
+        ///     This value is also assigned to <see cref="PmcData.Info.Level" /> within the provided profile.
+        /// </returns>
+        public static int? CalculateLevel(this PmcData pmcData, ExpTable[] expTable)
+        {
+            var accExp = 0;
+            for (var i = 0; i < expTable.Length; i++)
+            {
+                accExp += expTable[i].Experience ?? 0;
+
+                if (pmcData.Info.Experience < accExp)
+                {
+                    break;
+                }
+
+                pmcData.Info.Level = i + 1;
+            }
+
+            return pmcData.Info.Level;
+        }
     }
 }