Add authentication and improve server side configuration

RemoteExec.Server/Configuration/ApiKeyConfiguration.cs

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+namespace RemoteExec.Server.Configuration;
+
+public class ApiKeyConfiguration
+{
+    public required string Key { get; set; }
+    public string? Description { get; set; }
+    public bool Enabled { get; set; } = true;
+}

RemoteExec.Server/Configuration/AuthenticationConfiguration.cs

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+namespace RemoteExec.Server.Configuration;
+
+public class AuthenticationConfiguration
+{
+    public List<ApiKeyConfiguration> ApiKeys { get; set; } = [];
+}

RemoteExec.Server/Configuration/ExecutionConfiguration.cs

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+namespace RemoteExec.Server.Configuration;
+
+public class ExecutionConfiguration
+{
+    /// <summary>
+    /// Maximum number of concurrent tasks. Default is ProcessorCount * 2.
+    /// </summary>
+    public int? MaxConcurrentTasks { get; set; }
+
+    /// <summary>
+    /// Timeout for assembly loading requests in seconds. Default is 30 seconds.
+    /// </summary>
+    public int AssemblyLoadTimeoutSeconds { get; set; } = 30;
+}

RemoteExec.Server/Configuration/MetricsConfiguration.cs

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+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;
+}