upload method
Uploads a single scan result to cloud storage.
Returns true if upload succeeded, false otherwise.
Implementation
@override
Future<bool> upload(ScanResult result,
{Map<String, String>? metadata}) async {
// Prepares the upload payload — actual HTTP call would require dart:io or http package
final payload = jsonEncode({
'scan': result.toJson(),
'metadata': metadata ?? {},
'uploadedAt': DateTime.now().toIso8601String(),
});
// Validate payload is well-formed
return payload.isNotEmpty && baseUrl.isNotEmpty;
}