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/Tables/mfr__d_comments.sql

@@ -0,0 +1,11 @@
+CREATE TABLE [dbo].[mfr__d_comments] (
+    [Id]               BIGINT         NULL,
+    [Version]          INT            NULL,
+    [DateOfCreation]   DATETIME       NULL,
+    [IsInternal]       BIT            NULL,
+    [ServiceRequestId] BIGINT         NULL,
+    [CompanyId]        BIGINT         NULL,
+    [Content]          NVARCHAR (MAX) NULL,
+    [DateDeleted]      DATETIME       NULL
+);
+