Merge pull request 'CUB-5: Implement GET /filaments and GET /filaments/{id}' (#27) from agent/dex/CUB-5-get-filaments-endpoints into dev

backend/API/Controllers/FilamentsController.cs

@@ -40,6 +40,7 @@ public class FilamentsController : ControllerBase
     /// <response code="200">Returns the paginated list of filament spools.</response>
     [HttpGet]
     [ProducesResponseType(typeof(PagedResponse<FilamentResponse>), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status400BadRequest)]
     public async Task<ActionResult<PagedResponse<FilamentResponse>>> GetFilaments(
         [FromQuery] FilamentQueryParameters query)
     {