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__users.sql

@@ -0,0 +1,21 @@
+CREATE TABLE [dbo].[mfr__users] (
+    [Id]                      BIGINT         NOT NULL,
+    [Version]                 INT            NOT NULL,
+    [UserName]                NVARCHAR (255) NULL,
+    [IsSystem]                BIT            NOT NULL,
+    [CreationDate]            DATETIME       NOT NULL,
+    [IsApproved]              BIT            NOT NULL,
+    [ContactId]               BIGINT         NOT NULL,
+    [PreferedLanguage]        NVARCHAR (255) NULL,
+    [EmailChannelEnabled]     BIT            NOT NULL,
+    [HasFullScreenPreference] BIT            NOT NULL,
+    [TimeZone]                INT            NOT NULL,
+    [PreferedCulture]         NVARCHAR (255) NULL,
+    [IsActive]                BIT            NOT NULL,
+    [IsMobile]                BIT            NOT NULL,
+    [LastLoginDate]           DATETIME       NULL,
+    [UserGuideProgress]       NVARCHAR (255) NULL,
+    [DashboardSettings]       NVARCHAR (MAX) NULL,
+    CONSTRAINT [PK_mfr__user] PRIMARY KEY CLUSTERED ([Id] ASC)
+);
+