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/Functions/strings_replaceSpecialCharsInHTML.sql

@@ -0,0 +1,31 @@
+
+CREATE FUNCTION [dbo].[strings_replaceSpecialCharsInHTML]
+(
+    @inputHtml NVARCHAR(MAX)
+)
+RETURNS NVARCHAR(MAX)
+AS
+BEGIN
+    DECLARE @result NVARCHAR(MAX);
+
+	/* the order is important !! */
+
+
+    -- Replace ampersand ("&") with "&"
+    SET @inputHtml = REPLACE(@inputHtml, N'&', N'&');
+
+    -- Replace non-breaking space (ASCII 160) with " "
+    SET @inputHtml = REPLACE(@inputHtml, NCHAR(160), N' ');
+
+    -- Replace newline with "<br>"
+    SET @inputHtml = REPLACE(@inputHtml, NCHAR(10), N'<br>');
+
+    -- Replace copyright symbol ("©") with "&#169;"
+    SET @inputHtml = REPLACE(@inputHtml, NCHAR(169), N'&#169;');
+
+    -- Add more replacements for other special characters as needed
+
+    SET @result = @inputHtml;
+
+    RETURN @result;
+END;