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/fis_widgets.sql

@@ -0,0 +1,23 @@
+CREATE TABLE [dbo].[fis_widgets] (
+    [short_name]        VARCHAR (50)    NOT NULL,
+    [account]           VARCHAR (50)    NOT NULL,
+    [type]              NVARCHAR (50)   NOT NULL,
+    [name]              NVARCHAR (255)  NOT NULL,
+    [description]       NVARCHAR (1000) NULL,
+    [sql]               NVARCHAR (2000) NULL,
+    [sql_admin_columns] NVARCHAR (500)  NULL,
+    [sql_datatypes]     NVARCHAR (255)  NULL,
+    [url]               NVARCHAR (500)  NULL,
+    [html]              NVARCHAR (MAX)  NULL,
+    [visible_groups]    VARCHAR (1000)  NULL,
+    [visible]           TINYINT         CONSTRAINT [DF_fis_widgets_visible] DEFAULT ((1)) NOT NULL,
+    [auth_module]       VARCHAR (50)    NULL,
+    [rendering_options] NVARCHAR (255)  NULL,
+    [server_options]    NVARCHAR (2000) NULL,
+    [daycache]          BIT             CONSTRAINT [DF_fis_widgets_daychache] DEFAULT ((0)) NOT NULL,
+    [personalized]      BIT             CONSTRAINT [DF_fis_widgets_personalized] DEFAULT ((0)) NOT NULL,
+    [safemode]          BIT             CONSTRAINT [DF_fis_widgets_safemode] DEFAULT ((0)) NOT NULL,
+    [variables]         VARCHAR (1000)  NULL,
+    CONSTRAINT [PK_fis_widgets] PRIMARY KEY CLUSTERED ([short_name] ASC)
+);
+