Add function to retrieve company address as JSON and update invoice procedures

- Created a new function `fds__getCompanyAddressJson` to return a company's postal address as a structured JSON object.
- Modified stored procedures `fds__createInvoice`, `fds__setInvoice`, and `fds__prepInvoice` to include a new parameter `@SendToAddressJson` for handling the address data.
- Updated the invoice table and user-defined types to accommodate the new `SendToAddressJson` field.
- Ensured that the address data is properly retrieved and stored in the invoice records.

Fuchs/code/FdsInvoiceData.cs

@@ -83,6 +83,34 @@ public class FdsInvoiceData
         }
     }
 
+    /// <summary>
+    /// Structured recipient (buyer) address for eRechnung (EN 16931) mapping, parsed from the
+    /// <c>CustomValues</c> JSON (interim persistence — see ADR 0012). Null for invoices that
+    /// predate structured capture; callers fall back to the free-text <c>SendToAddress</c> block.
+    /// </summary>
+    public Fuchs.Services.InvoiceRecipientAddress? RecipientAddress
+    {
+        get
+        {
+            // Prefer the dedicated SendToAddressJson column; fall back to the CustomValues blob
+            // (interim persistence and rows written before the column existed).
+            string col = InvoiceRegistration?.getString("SendToAddressJson") ?? "";
+            if (col.Length > 0)
+            {
+                try { return Fuchs.Services.InvoiceRecipientAddress.FromJson(JObject.Parse(col)); }
+                catch { /* fall through to CustomValues */ }
+            }
+            return Fuchs.Services.InvoiceRecipientAddress.FromCustomValues(
+                InvoiceRegistration?.getString("CustomValues") is { Length: > 0 } cv ? cv : RawCustomValues);
+        }
+    }
+
+    /// <summary>The structured recipient address serialised for the <c>SendToAddressJson</c> column
+    /// (from the posted CustomValues blob), or empty when the invoice has no structured address.</summary>
+    private string SendToAddressJsonForPersist() =>
+        Fuchs.Services.InvoiceRecipientAddress.FromCustomValues(RawCustomValues)?.ToJson()
+            .ToString(Newtonsoft.Json.Formatting.None) ?? "";
+
     /// <summary>VAT rows keyed by percentage string (e.g. "19"), from InvoiceRegistration.</summary>
     public Dictionary<string, Dictionary<string, object?>> VatRows
     {
@@ -153,6 +181,7 @@ public class FdsInvoiceData
             SQL_NVarChar("@SendToEmail",        RawInvoiceEmail),
             SQL_NVarChar("@ProvisionPeriod",    RawProvisionPeriod, dbNull_IfEmpty: true),
             SQL_NVarChar("@CustomValues",       RawCustomValues, dbNull_IfEmpty: true),
+            SQL_NVarChar("@SendToAddressJson",  SendToAddressJsonForPersist(), dbNull_IfEmpty: true),
             SQL_Float("@InvoiceService_net",    stringvalue: Sms?.nz("tscn") ?? "0"),
             SQL_Float("@InvoiceService_VAT",    stringvalue: Sms?.nz("tscvat") ?? "0"),
             SQL_VarChar("@InvoiceOptions", BuildInvoiceOptions(), dbNull_IfEmpty: true)

Fuchs/code/FuchsPdf.cs

@@ -979,18 +979,26 @@ public static class FuchsPdf
         }
     }
 
-    /// <summary>Renders a MigraDoc Document to a PDF/A byte array.</summary>
-    public static byte[] DocToPdfBytes(Document doc)
+    /// <summary>
+    /// Renders a MigraDoc Document to a plain (non-PDF/A) PDF byte array. Fonts are embedded via
+    /// the <c>OCOREFontResolver</c>, but no PDF/A post-processing is applied. This is the visual
+    /// PDF fed into <c>eRechnungLib.ToZugferd(...)</c>, which owns the single PDF/A-3 conversion
+    /// for eRechnung output (avoiding a conflicting second PDF/A layer from Spire). See ADR 0005.
+    /// </summary>
+    public static byte[] DocToPdfBytesRaw(Document doc)
     {
         EnsureFontResolver();
         var renderer = new PdfDocumentRenderer() { Document = doc };
         renderer.RenderDocument();
         using var ms = new MemoryStream();
         renderer.PdfDocument.Save(ms, closeStream: false);
-        ms.Position = 0;
-        return OCORE.pdf._pdf.pdfAFileContent(ms.ToArray());
+        return ms.ToArray();
     }
 
+    /// <summary>Renders a MigraDoc Document to a PDF/A byte array (Spire post-processing).</summary>
+    public static byte[] DocToPdfBytes(Document doc)
+        => OCORE.pdf._pdf.pdfAFileContent(DocToPdfBytesRaw(doc));
+
     /// <summary>Renders a MigraDoc Document to an ImageCollection for preview.</summary>
     public static async Task<OCORE.pdf._pdf.ImageCollection> DocToImageCollection(Document doc)
     {