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__setReminderFile.sql

@@ -0,0 +1,21 @@
+
+-- =============================================
+-- Author:		<Author,,Name>
+-- Create date: <Create Date,,>
+-- Description:	<Description,,>
+-- =============================================
+CREATE PROCEDURE [dbo].[fds__setReminderFile]
+	@Id varchar(8),
+	@file varbinary(max)
+AS
+BEGIN
+	SET NOCOUNT ON;
+	DECLARE @now datetime = GETUTCDATE();
+
+    UPDATE rem SET [file] = @file, [version] = (ISNULL([version],0) + 1)
+		, [DocumentName] = ([dbo].[fds__fn_ReminderDocumentName]([type],[subject],[DateFinalized],(SELECT TOP(1) [invoiceid] From [dbo].[fds__invoices] WHERE [id] = rem.[invId])))
+	OUTPUT inserted.[Id]
+	FROM [dbo].[fds__reminder] as rem
+		WHERE [Id] = @Id AND @Id is not null and [file] is null;
+
+END