refactor: move atomic.Value to value.go, improved handling for zero values

internal/utils/atomic/value.go

@@ -0,0 +1,34 @@
+package atomic
+
+import (
+	"encoding/json"
+	"sync/atomic"
+)
+
+type Value[T any] struct {
+	atomic.Value
+}
+
+func (a *Value[T]) Load() T {
+	if v := a.Value.Load(); v != nil {
+		return v.(T)
+	}
+	var zero T
+	return zero
+}
+
+func (a *Value[T]) Store(v T) {
+	a.Value.Store(v)
+}
+
+func (a *Value[T]) Swap(v T) T {
+	if v := a.Value.Swap(v); v != nil {
+		return v.(T)
+	}
+	var zero T
+	return zero
+}
+
+func (a *Value[T]) MarshalJSON() ([]byte, error) {
+	return json.Marshal(a.Load())
+}