feat: Add millisToDuration utility function for converting milliseconds to time.Duration with zero handling

apps/api-server/internal/handlers/util_time.go

@@ -0,0 +1,10 @@
+package handlers
+
+import "time"
+
+func millisToDuration(ms int64) time.Duration {
+	if ms <= 0 {
+		return 0
+	}
+	return time.Duration(ms) * time.Millisecond
+}