Refactor code structure for improved readability and maintainability

Old/Models/LogEntry.cs

@@ -0,0 +1,27 @@
+namespace TradingBot.Models;
+
+/// <summary>
+/// Represents a log entry with timestamp, severity and message
+/// </summary>
+public class LogEntry
+{
+    public Guid Id { get; set; } = Guid.NewGuid();
+    public DateTime Timestamp { get; set; } = DateTime.UtcNow;
+    public LogLevel Level { get; set; }
+    public string Category { get; set; } = string.Empty;
+    public string Message { get; set; } = string.Empty;
+    public string? Details { get; set; }
+    public string? Symbol { get; set; }
+}
+
+/// <summary>
+/// Log severity levels
+/// </summary>
+public enum LogLevel
+{
+    Debug,
+    Info,
+    Warning,
+    Error,
+    Trade
+}