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__getCompanyAddress.sql

@@ -0,0 +1,36 @@
+-- =============================================
+-- Author:		<Author,,Name>
+-- Create date: <Create Date, ,>
+-- Description:	<Description, ,>
+-- =============================================
+CREATE FUNCTION [dbo].[fds__getCompanyAddress]
+(
+	@companyid bigint
+)
+RETURNS nvarchar(1000)
+AS
+BEGIN
+	DECLARE @locationid bigint,  @address nvarchar(1000);
+
+	SELECT TOP(1) @locationid = cy.[Location#ID] from [dbo].[mfr__companies] as cy WHERE cy.id = @companyid;
+
+	IF @locationid is null 
+		SELECT TOP(1) @locationid = l.[ID], @address = [dbo].[fds__fn_combineAddress] (l.[AddressString], null, null
+													  ,l.[Postal]
+													  ,l.[City]
+													  ,l.[State]
+													  ,l.[Country])  FROM [mfr__#locations] as l JOIN [dbo].[mfr__companies] as cy on l.[Property] = 'Company:Location' AND l.[EntityId] = cy.[Id] WHERE cy.[id] = @companyid;
+
+	-- Return the result of the function
+	
+	IF @address is null 
+	SELECT TOP(1) @address = [dbo].[fds__fn_combineAddress] (loc.[AddressString], null, null
+													  ,loc.[Postal]
+													  ,loc.[City]
+													  ,loc.[State]
+													  ,loc.[Country]) 
+					FROM [dbo].[mfr__#locations] as loc WHERE [id] = @locationid;
+
+	RETURN @address;
+
+END