Add authentication and improve server side configuration

RemoteExec.Server/Configuration/MetricsConfiguration.cs

@@ -0,0 +1,19 @@
+namespace RemoteExec.Server.Configuration;
+
+public class MetricsConfiguration
+{
+    /// <summary>
+    /// Minimum CPU usage difference (in percentage points) to trigger a metrics broadcast. Default is 1.0.
+    /// </summary>
+    public double CpuDifferenceThreshold { get; set; } = 1.0;
+
+    /// <summary>
+    /// Minimum memory usage difference (in bytes) to trigger a metrics broadcast. Default is 10 MB.
+    /// </summary>
+    public long MemoryDifferenceThreshold { get; set; } = 10 * 1024 * 1024;
+
+    /// <summary>
+    /// Broadcast interval in milliseconds. Default is 500 ms.
+    /// </summary>
+    public int BroadcastIntervalMs { get; set; } = 500;
+}