Добавлены mermaid диаграммы

SQLLinter/Infrastructure/Diagram/FragmentDiagramBuilder.cs

@@ -0,0 +1,51 @@
+using System.Text;
+using Microsoft.SqlServer.TransactSql.ScriptDom;
+using System;
+using System.Linq;
+using System.Collections.Generic;
+
+namespace SQLLinter.Infrastructure.Diagram;
+
+public static class FragmentDiagramBuilder
+{
+    public static string RenderMermaid(TSqlFragment fragment)
+    {
+        if (fragment == null) return string.Empty;
+        var diagram = BpmnBuilder.Build(fragment);
+        return MermaidRenderer.RenderMarkdown(diagram);
+    }
+
+    public static string RenderHtmlSvg(TSqlFragment fragment)
+    {
+        if (fragment == null) return string.Empty;
+        var diagram = BpmnBuilder.Build(fragment);
+        // Use mermaid HTML instead of SVG fallback
+        return MermaidRenderer.RenderHtml(diagram);
+    }
+
+    // keep helpers used by earlier code if needed
+    private static string Escape(string s)
+    {
+        if (s == null) return string.Empty;
+        return System.Net.WebUtility.HtmlEncode(s).Replace("\n", " ").Replace("\r", " ");
+    }
+
+    private static string Truncate(string s, int len)
+    {
+        if (s == null) return string.Empty;
+        if (s.Length <= len) return s;
+        return s.Substring(0, len - 3) + "...";
+    }
+
+    private static string SanitizeId(string s)
+    {
+        if (string.IsNullOrEmpty(s)) return "id";
+        var sb = new StringBuilder();
+        foreach (var ch in s)
+        {
+            if (char.IsLetterOrDigit(ch)) sb.Append(ch);
+            else sb.Append('_');
+        }
+        return sb.ToString();
+    }
+}