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__contacts.sql

@@ -0,0 +1,27 @@
+CREATE TABLE [dbo].[mfr__contacts] (
+    [Id]           BIGINT          NOT NULL,
+    [CustomValues] NVARCHAR (MAX)  NOT NULL,
+    [FirstName]    NVARCHAR (255)  NULL,
+    [LastName]     NVARCHAR (255)  NULL,
+    [Email]        NVARCHAR (255)  NULL,
+    [JobTitle]     NVARCHAR (255)  NULL,
+    [MobilePhone]  NVARCHAR (255)  NULL,
+    [Telephone]    NVARCHAR (255)  NULL,
+    [Fax]          NVARCHAR (255)  NULL,
+    [Note]         NVARCHAR (1000) NULL,
+    [DateModified] DATETIME        NOT NULL,
+    [Version]      INT             NOT NULL,
+    [CompanyId]    BIGINT          NOT NULL,
+    [IsUser]       BIT             NOT NULL,
+    [ExternalId]   NVARCHAR (255)  NULL,
+    [Gender]       NVARCHAR (255)  NULL,
+    [UserId]       BIGINT          NOT NULL,
+    CONSTRAINT [PK_mfr__contact] PRIMARY KEY CLUSTERED ([Id] ASC)
+);
+
+
+GO
+CREATE NONCLUSTERED INDEX [mfr__contacts__ix1]
+    ON [dbo].[mfr__contacts]([CompanyId] ASC)
+    INCLUDE([CustomValues], [FirstName], [LastName], [Email], [JobTitle], [MobilePhone], [Telephone], [Fax], [Note], [DateModified], [Version], [IsUser], [ExternalId], [Gender], [UserId]);
+