Changes

rag-api/Controllers/RagController.cs

@@ -1,6 +1,6 @@
 using Microsoft.AspNetCore.Mvc;
 using Api.Services.Contracts;
-using Api.Requests;
+using Api.Models.Requests;
 
 namespace Api.Controllers;
 
@@ -83,7 +83,7 @@ public sealed class RagController : ControllerBase
         try
         {
             _logger.LogInformation("Semantic search request received. TargetTypes={TargetTypes}, TopK={TopK}",
-                string.Join(',', request.TargetDocumentTypes ?? []), request.TopK);
+                string.Join(',', request.TargetDocumentTypes ?? System.Array.Empty<string>()), request.TopK);
             var result = await _ragService.SearchAsync(request, ct);
             _logger.LogInformation("Semantic search completed. ResultCount={ResultCount}", result.Results.Count);
             return Ok(result);