Use XML geometry for critical PDF import

src/RolemasterDb.ImportTool/PdfXmlExtractor.cs

@@ -0,0 +1,36 @@
+using System.Diagnostics;
+
+namespace RolemasterDb.ImportTool;
+
+public sealed class PdfXmlExtractor
+{
+    public async Task ExtractAsync(string pdfPath, string outputPath, CancellationToken cancellationToken = default)
+    {
+        Directory.CreateDirectory(Path.GetDirectoryName(outputPath)!);
+
+        var startInfo = new ProcessStartInfo
+        {
+            FileName = "pdftohtml",
+            RedirectStandardError = true,
+            RedirectStandardOutput = true,
+            UseShellExecute = false,
+            CreateNoWindow = true
+        };
+
+        startInfo.ArgumentList.Add("-xml");
+        startInfo.ArgumentList.Add("-i");
+        startInfo.ArgumentList.Add("-noframes");
+        startInfo.ArgumentList.Add(pdfPath);
+        startInfo.ArgumentList.Add(outputPath);
+
+        using var process = new Process { StartInfo = startInfo };
+        process.Start();
+        await process.WaitForExitAsync(cancellationToken);
+
+        if (process.ExitCode != 0)
+        {
+            var error = await process.StandardError.ReadToEndAsync(cancellationToken);
+            throw new InvalidOperationException($"pdftohtml failed for '{pdfPath}': {error}");
+        }
+    }
+}