Implemented node system statistics

MoonlightServers.Daemon/Http/Controllers/SystemController.cs

@@ -0,0 +1,22 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using MoonlightServers.Daemon.Helpers;
+using MoonlightServers.Daemon.Mappers;
+using MoonlightServers.DaemonShared.Http.Daemon;
+
+namespace MoonlightServers.Daemon.Http.Controllers;
+
+[Authorize]
+[ApiController]
+[Route("api/system")]
+public class SystemController : Controller
+{
+    [HttpGet("statistics")]
+    public async Task<ActionResult<SystemStatisticsDto>> GetStatisticsAsync()
+    {
+        var snapshot = await SystemMetrics.ReadAllAsync();
+        var statistics = SystemStatisticsMapper.ToDto(snapshot);
+
+        return statistics;
+    }
+}