Enhance banking transaction data structure and validation

- Increased the length of the NameOfPayer field from NVARCHAR(60) to NVARCHAR(140) in the banking transactions function, table, temporary table, and user-defined type to accommodate longer names.
- Expanded the SepaRemittanceInformation field from VARCHAR(150) to VARCHAR(200) in the banking transactions function for more detailed remittance information.
- Modified the stored procedure fds__setBankingtransaction_done to return additional transaction data (ValueDate and Amount) along with the success flag for improved notification messaging.
- Added validation in MFRClientConfig constructor to ensure the provided URL is not null or empty, enhancing error handling for configuration settings.

MFR_RESTClient/MFRClientModels.cs

@@ -25,6 +25,9 @@ public class MFRClientConfig
 
     public MFRClientConfig(string url)
     {
+        if (string.IsNullOrWhiteSpace(url))
+            throw new ArgumentException("MFR host must not be null or empty (check the 'Fds:MFR_host' configuration entry).", nameof(url));
+
         BaseUrl = url.StartsWith("http") ? url : $"https://{url.Trim()}/odata/";
         if (!BaseUrl.EndsWith("/")) BaseUrl += "/";
         // Derive the REST root (/mfr/) from the same scheme+host as the OData root.