fix(invoices): send invoice amounts as exact cent-rounded decimals

Stornorechnung saves still failed: the VAT amount was formatted invariantly
("-615.3757999999999") and re-parsed under the server's de-DE culture as
-6153757999999999, overflowing numeric(10,3) in fds__setInvoice.

- FdsInvoiceData.BuildInvoiceParams: amount params are decimal(10,x) via
  AmountParam/ParseAmount (culture-independent, rounded to cents); amounts
  beyond +/-9,999,999.99 throw InvoiceAmountOutOfRangeException.
- InvoiceService.RegisterInvoiceAsync: refuses such an invoice with a logged
  error (EventId InvoiceAmountRejected) instead of storing a wrong amount.
- Invoice editor: vat_val is cent-rounded decimal, no float noise.
- Tests: InvoiceAmountParamTests replaces the float-based Storno test.
- Bump Azure.Storage.Blobs 12.30.0; OCORE/OCORE_web submodules (AngleSharp
  1.8.3, Azure.Storage.Files.Shares 12.28.0).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Fuchs/Services/InvoiceService.cs

@@ -70,6 +70,8 @@ public class InvoiceService : IInvoiceService
 
     private string Conn => _intranet.Intranet__SQLConnectionString;
 
+    private static readonly EventId InvoiceAmountRejected = new(0, "InvoiceAmountRejected");
+
     public async Task<FdsInvoiceData> LoadInvoiceAsync(string id, string userAccountId, DatabaseSecurity dbSec)
     {
         _logger.LogDebug("LoadInvoiceAsync id={Id} user={User}", id, userAccountId);
@@ -179,7 +181,18 @@ public class InvoiceService : IInvoiceService
         if (invoice.NewValues == null) { _logger.LogWarning("RegisterInvoiceAsync: no form values supplied (user={User})", userAccountId); return invoice; }
 
         var pl = new List<SqlParameter> { SQL_VarChar("@authuser", userAccountId) };
-        pl.AddRange(invoice.BuildInvoiceParams(change, invId));
+        try
+        {
+            pl.AddRange(invoice.BuildInvoiceParams(change, invId));
+        }
+        catch (InvoiceAmountOutOfRangeException ex)
+        {
+            // Refuse rather than store a wrong amount; an empty registration makes the caller report the save as failed.
+            _logger.LogError(InvoiceAmountRejected, ex,
+                "RegisterInvoiceAsync: refused invoice {InvId} - amount {Parameter} = {Value} is out of range (user={User})",
+                invId, ex.Parameter, ex.Value, userAccountId);
+            return invoice;
+        }
 
         if (change) pl.Add(SQL_VarChar("@InvId", invId));
         bool hasProvisionLocation = invoice.RawProvisionLocation.Length > 0;