edit

Services/PdfStorageService.cs

@@ -15,7 +15,15 @@ internal sealed class PdfStorageService
         _client = client;
         var options = configuration.GetSection("Crawler").Get<CrawlerOptions>()
                       ?? throw new InvalidOperationException("Раздел Crawler не найден в appsettings.json.");
-        _rootPath = Environment.ExpandEnvironmentVariables(options.PdfStoragePath);
+        var configuredPath = Environment.ExpandEnvironmentVariables(options.PdfStoragePath ?? string.Empty).Trim();
+        if (string.IsNullOrWhiteSpace(configuredPath))
+        {
+            configuredPath = "PdfStore";
+        }
+
+        _rootPath = Path.IsPathRooted(configuredPath)
+            ? configuredPath
+            : Path.GetFullPath(Path.Combine(AppContext.BaseDirectory, configuredPath));
         Directory.CreateDirectory(_rootPath);
     }