Test: Add document app tests (#8456)

### What problem does this PR solve?

- Add new test suite for document app with
create/list/parse/upload/remove tests
- Update API URLs to use version variable from config in HTTP and web
API tests

### Type of change

- [x] Add test cases

test/testcases/test_web_api/test_document_app/conftest.py

@@ -0,0 +1,58 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#
+
+
+import pytest
+from common import bulk_upload_documents, delete_document, list_documents
+
+
+@pytest.fixture(scope="function")
+def add_document_func(request, WebApiAuth, add_dataset, ragflow_tmp_dir):
+    def cleanup():
+        res = list_documents(WebApiAuth, {"kb_id": dataset_id})
+        for doc in res["data"]["docs"]:
+            delete_document(WebApiAuth, {"doc_id": doc["id"]})
+
+    request.addfinalizer(cleanup)
+
+    dataset_id = add_dataset
+    return dataset_id, bulk_upload_documents(WebApiAuth, dataset_id, 1, ragflow_tmp_dir)[0]
+
+
+@pytest.fixture(scope="class")
+def add_documents(request, WebApiAuth, add_dataset, ragflow_tmp_dir):
+    def cleanup():
+        res = list_documents(WebApiAuth, {"kb_id": dataset_id})
+        for doc in res["data"]["docs"]:
+            delete_document(WebApiAuth, {"doc_id": doc["id"]})
+
+    request.addfinalizer(cleanup)
+
+    dataset_id = add_dataset
+    return dataset_id, bulk_upload_documents(WebApiAuth, dataset_id, 5, ragflow_tmp_dir)
+
+
+@pytest.fixture(scope="function")
+def add_documents_func(request, WebApiAuth, add_dataset_func, ragflow_tmp_dir):
+    def cleanup():
+        res = list_documents(WebApiAuth, {"kb_id": dataset_id})
+        for doc in res["data"]["docs"]:
+            delete_document(WebApiAuth, {"doc_id": doc["id"]})
+
+    request.addfinalizer(cleanup)
+
+    dataset_id = add_dataset_func
+    return dataset_id, bulk_upload_documents(WebApiAuth, dataset_id, 3, ragflow_tmp_dir)