added remove all item from queue

tests/api/test_download_endpoints.py

@@ -335,6 +335,22 @@ async def test_clear_completed(authenticated_client, mock_download_service):
     mock_download_service.clear_completed.assert_called_once()
 
 
+@pytest.mark.asyncio
+async def test_clear_pending(authenticated_client, mock_download_service):
+    """Test DELETE /api/queue/pending endpoint."""
+    mock_download_service.clear_pending = AsyncMock(return_value=3)
+    
+    response = await authenticated_client.delete("/api/queue/pending")
+
+    assert response.status_code == 200
+    data = response.json()
+
+    assert data["status"] == "success"
+    assert data["count"] == 3
+
+    mock_download_service.clear_pending.assert_called_once()
+
+
 @pytest.mark.asyncio
 async def test_retry_failed(authenticated_client, mock_download_service):
     """Test POST /api/queue/retry endpoint."""