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_status_test.go

@@ -3,6 +3,7 @@ package syncengine
 import (
 	"context"
 	"net"
+	"sync/atomic"
 	"testing"
 	"time"
 
@@ -37,3 +38,29 @@ func TestIsReachableTimeout(t *testing.T) {
 		t.Errorf("IsReachable returned too early: %v", d)
 	}
 }
+
+func TestProbeThrottle(t *testing.T) {
+	e := &Engine{lastProbeAt: atomic.Int64{}}
+
+	e.lastProbeAt.Store(time.Now().UnixNano())
+
+	now := time.Now().UnixNano()
+	last := e.lastProbeAt.Load()
+	if now-last < int64(probeThrottleSeconds*time.Second) {
+		return
+	}
+	t.Error("throttle check did not run as expected")
+}
+
+func TestProbeConstants(t *testing.T) {
+	if probeThrottleSeconds != 10 {
+		t.Errorf("probeThrottleSeconds = %d, want 10", probeThrottleSeconds)
+	}
+	if probeTimeout != 1500*time.Millisecond {
+		t.Errorf("probeTimeout = %v, want 1500ms", probeTimeout)
+	}
+	if probeMaxConcurrent != 20 {
+		t.Errorf("probeMaxConcurrent = %d, want 20", probeMaxConcurrent)
+	}
+}
+