Bump version to 1.0.10

Smart WoL: TCP pre-check before sending magic packet (3s timeout).
Machine status updates via SSE: online/offline tracked in DB and
broadcast to all connected browser tabs in real-time.
- Pre-check: if machine already reachable, skip WoL and mark online
- WoL path: send 3 magic packets, wait for SSH, mark online/offline
- Backend: setMachineStatus() helper + machine_status SSE event
- Frontend: subscribeMachineStatus() SSE helper for Machines + Dashboard
- IsReachable() helper in wol package for TCP reachability checks

internal/wol/waiter.go

@@ -45,3 +45,16 @@ func WaitUntilReady(ctx context.Context, host string, sshPort int, maxWait, chec
 		}
 	}
 }
+
+func IsReachable(ctx context.Context, host string, port int, timeout time.Duration) bool {
+	ctx, cancel := context.WithTimeout(ctx, timeout)
+	defer cancel()
+	addr := fmt.Sprintf("%s:%d", host, port)
+	dialer := net.Dialer{Timeout: timeout}
+	conn, err := dialer.DialContext(ctx, "tcp", addr)
+	if err != nil {
+		return false
+	}
+	conn.Close()
+	return true
+}