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/Functions/fds__getCompanyContacts.sql

@@ -0,0 +1,31 @@
+-- =============================================
+-- Author:		<Author,,Name>
+-- Create date: <Create Date,,>
+-- Description:	<Description,,>
+-- =============================================
+CREATE FUNCTION [dbo].[fds__getCompanyContacts]
+(	
+	@companyid bigint
+)
+RETURNS TABLE 
+AS
+RETURN 
+(
+	WITH ps as (
+			SELECT [contactid] = p.[EntityId] from [mfr__*PartnerSet] as p WHERE p.property = 'Contact:Company' and p.[partnerId] = @companyid
+			UNION
+			SELECT [contactid] = p.[PartnerId] from [mfr__*PartnerSet] as p WHERE p.property = 'Company:Contacts' and p.[EntityId] = @companyid			
+	)
+	SELECT ct.*
+		,[isMainContact] = CAST( CASE WHEN cy.[MainContactId] is null then 0 WHEN cy.[MainContactId] = ct.[id] THEN 1 ELSE 0 END  as bit)
+	FROM [dbo].[mfr__contacts] as ct 
+		JOIN [dbo].[mfr__companies] as cy ON ct.[CompanyId] = cy.[id]
+	WHERE ct.CompanyId = @companyid
+	UNION
+	SELECT ct.*
+		,[isMainContact] = CAST( CASE WHEN cy.[MainContactId] is null then 0 WHEN cy.[MainContactId] = ct.[id] THEN 1 ELSE 0 END  as bit)
+	FROM [dbo].[mfr__contacts] as ct 
+		JOIN ps ON ct.[id] = ps.[contactid]
+		JOIN [dbo].[mfr__companies] as cy ON cy.[id] = @companyid
+	
+)