Bump version to 1.0.11

Machine status probe on page load:
- POST /api/machines/refresh probes all machines in parallel (max 20 concurrent, 1.5s timeout)
- Updates DB status and broadcasts via SSE to all connected browser tabs
- Server-side throttle: ignores refresh requests within 10s
- Machines.tsx and Dashboard.tsx fire probe on mount
- Visual "Checking machine status..." indicator in Machines table
- MachineHandler now accepts *Engine for ProbeAllMachines access

internal/syncengine/engine.go

@@ -17,12 +17,13 @@ import (
 )
 
 type Engine struct {
-	db       *sql.DB
-	cfg      *config.Config
-	queue    *Queue
-	eventBus *EventBus
-	mu       sync.RWMutex
-	stopped  bool
+	db           *sql.DB
+	cfg          *config.Config
+	queue        *Queue
+	eventBus     *EventBus
+	mu           sync.RWMutex
+	stopped      bool
+	lastProbeAt  atomic.Int64
 }
 
 type Event struct {
@@ -333,3 +334,51 @@ func (e *Engine) CreateJob(syncPairID int64, triggerType string) (int64, error)
 	}
 	return id, nil
 }
+
+const (
+	probeThrottleSeconds = 10
+	probeTimeout         = 1500 * time.Millisecond
+	probeMaxConcurrent   = 20
+)
+
+func (e *Engine) ProbeAllMachines() {
+	now := time.Now().UnixNano()
+	last := e.lastProbeAt.Load()
+
+	if now-last < int64(probeThrottleSeconds*time.Second) {
+		slog.Debug("ProbeAllMachines: skipped (throttled)")
+		return
+	}
+	if !e.lastProbeAt.CompareAndSwap(last, now) {
+		return
+	}
+
+	machineRepo := models.NewMachineRepository(e.db)
+	ms, err := machineRepo.GetAll()
+	if err != nil {
+		slog.Warn("ProbeAllMachines: list failed", "error", err)
+		return
+	}
+
+	sem := make(chan struct{}, probeMaxConcurrent)
+	var wg sync.WaitGroup
+
+	for i := range ms {
+		wg.Add(1)
+		sem <- struct{}{}
+		go func(m *models.Machine) {
+			defer wg.Done()
+			defer func() { <-sem }()
+
+			ctx, cancel := context.WithTimeout(context.Background(), probeTimeout)
+			defer cancel()
+
+			status := "offline"
+			if wol.IsReachable(ctx, m.Host, m.Port, probeTimeout) {
+				status = "online"
+			}
+			e.setMachineStatus(m.ID, status)
+		}(&ms[i])
+	}
+	wg.Wait()
+}