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/syncengine/engine_status_test.go

@@ -0,0 +1,39 @@
+package syncengine
+
+import (
+	"context"
+	"net"
+	"testing"
+	"time"
+
+	"github.com/syncserver/internal/wol"
+)
+
+func TestIsReachable(t *testing.T) {
+	ln, err := net.ListenTCP("tcp4", &net.TCPAddr{IP: net.ParseIP("127.0.0.1"), Port: 0})
+	if err != nil {
+		t.Skipf("skipping test (no TCP listener available): %v", err)
+	}
+	defer ln.Close()
+	addr := ln.Addr().(*net.TCPAddr)
+
+	ctx := context.Background()
+
+	if !wol.IsReachable(ctx, "127.0.0.1", addr.Port, 500*time.Millisecond) {
+		t.Error("expected reachable on listening port")
+	}
+	if wol.IsReachable(ctx, "127.0.0.1", addr.Port+1, 500*time.Millisecond) {
+		t.Error("expected unreachable on non-listening port")
+	}
+}
+
+func TestIsReachableTimeout(t *testing.T) {
+	ctx := context.Background()
+	start := time.Now()
+	if wol.IsReachable(ctx, "192.0.2.1", 12345, 500*time.Millisecond) {
+		t.Error("expected unreachable for non-routable IP")
+	}
+	if d := time.Since(start); d < 400*time.Millisecond {
+		t.Errorf("IsReachable returned too early: %v", d)
+	}
+}