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__remInvoice_Items.sql

@@ -0,0 +1,18 @@
+
+-- =============================================
+-- Author:		<Author,,Name>
+-- Create date: <Create Date,,>
+-- Description:	<Description,,>
+-- =============================================
+CREATE PROCEDURE [dbo].[fds__remInvoice_Items]
+	@Id varchar(10),
+	@authuser varchar(25)
+AS
+BEGIN
+	SET NOCOUNT ON;
+
+    DELETE FROM [dbo].[fds__invoice_items] WHERE [InvId] = @Id AND @Id is not null AND NOT EXISTS (SELECT * FROM [dbo].[fds__invoices] WHERE [Id] = @Id AND ([isFinal] = 1 OR [isSent] = 1 OR [file] is not null));  --make sure it's not deleted for final invoices
+	
+
+
+END