Add system control feature for remote shutdown/restart with timer support and UI integration

Controllers/ResourceController.cs

@@ -154,5 +154,85 @@ namespace ResourceMonitorService.Controllers
                 return StatusCode(500, "Internal server error");
             }
         }
+
+        [HttpPost("system-control")]
+        public ActionResult SystemControl([FromBody] SystemControlRequest request)
+        {
+            try
+            {
+                if (request == null)
+                {
+                    return BadRequest("Invalid request");
+                }
+
+                // Validate action
+                if (request.Action != "shutdown" && request.Action != "restart")
+                {
+                    return BadRequest("Invalid action. Use 'shutdown' or 'restart'");
+                }
+
+                // Validate timer
+                if (request.Timer < 0 || request.Timer > 86400)
+                {
+                    return BadRequest("Timer must be between 0 and 86400 seconds (24 hours)");
+                }
+
+                // Build the shutdown command
+                var arguments = request.Action == "shutdown" ? "/s" : "/r";
+                
+                if (request.Force)
+                {
+                    arguments += " /f";
+                }
+                
+                if (request.Timer > 0)
+                {
+                    arguments += $" /t {request.Timer}";
+                }
+
+                // Execute the shutdown command
+                var processInfo = new ProcessStartInfo
+                {
+                    FileName = "shutdown",
+                    Arguments = arguments,
+                    UseShellExecute = false,
+                    CreateNoWindow = true
+                };
+
+                var process = Process.Start(processInfo);
+                
+                string message;
+                if (request.Timer > 0)
+                {
+                    var minutes = request.Timer / 60;
+                    var seconds = request.Timer % 60;
+                    var timeString = minutes > 0 
+                        ? $"{minutes} minute{(minutes != 1 ? "s" : "")}" + (seconds > 0 ? $" and {seconds} second{(seconds != 1 ? "s" : "")}" : "")
+                        : $"{seconds} second{(seconds != 1 ? "s" : "")}";
+                    
+                    message = $"System {request.Action} scheduled in {timeString}";
+                }
+                else
+                {
+                    message = $"System {request.Action} initiated immediately";
+                }
+
+                _logger.LogWarning($"System {request.Action} command executed by user. Timer: {request.Timer}s, Force: {request.Force}");
+                
+                return Ok(new { message });
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, $"Error executing system {request?.Action} command");
+                return StatusCode(500, "Internal server error");
+            }
+        }
+    }
+
+    public class SystemControlRequest
+    {
+        public string Action { get; set; } = string.Empty;
+        public int Timer { get; set; } = 0;
+        public bool Force { get; set; } = true;
     }
 }