Add Fuchs_Database SSDT project (schema source of truth)

Adds the SQL Server Data Tools project for the fuchs_fds database — tables,
table types, functions and stored procedures that the backend calls (e.g.
fds__getInvoice, fds__merge_bankingtransactions, fds__tt__bankingtransactions,
fds__admin_getReportCatalog, fis_* auth). Build/model caches (bin, obj,
*.dbmdl, *.jfm, *.user) are git-ignored.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Fuchs_Database/dbo/Stored Procedures/fds__fn_getMFRInvoicesWithoutfiles.sql

@@ -0,0 +1,14 @@
+-- =============================================
+-- Author:		<Author,,Name>
+-- Create date: <Create Date,,>
+-- Description:	<Description,,>
+-- =============================================
+CREATE PROCEDURE [dbo].[fds__fn_getMFRInvoicesWithoutfiles]
+	
+AS
+BEGIN
+	SET NOCOUNT ON;
+
+    select TOP(0) [id],i.[URI],i.[DocumentName] from mfr__invoices as i where not exists (SELECT 0 FROM [dbo].[fds__mfr_invoicefiles] as f where f.[Id] = i.[id]) AND i.[documentname] like '%.pdf'
+		ORDER by (SELECT TOP(1) [rn] FROM [dbo].[ocms_fn_rand]);
+END