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_appointments.sql

@@ -0,0 +1,17 @@
+CREATE TABLE [dbo].[mfr__d_appointments] (
+    [Id]                  BIGINT         NULL,
+    [Version]             INT            NULL,
+    [State]               NVARCHAR (255) NULL,
+    [Type]                NVARCHAR (255) NULL,
+    [EndDateTime]         DATETIME       NULL,
+    [StartDateTime]       DATETIME       NULL,
+    [DrivingDistanceFrom] INT            NULL,
+    [DrivingDistanceTo]   INT            NULL,
+    [WasReadOnClientSide] BIT            NULL,
+    [ContactIds]          VARCHAR (MAX)  NULL,
+    [ServiceRequestId]    BIGINT         NULL,
+    [ContactId]           BIGINT         NULL,
+    [Note]                NVARCHAR (MAX) NULL,
+    [DateDeleted]         DATETIME       NULL
+);
+