tests: improve RAGFlow coverage based on Codecov report (#13200)

### What problem does this PR solve?

Codecov’s coverage report shows that several RAGFlow code paths are
currently untested or under-tested. This makes it easier for regressions
to slip in during refactors and feature work.
This PR adds targeted automated tests to cover the files and branches
highlighted by Codecov, improving confidence in core behavior while
keeping runtime functionality unchanged.

### Type of change

- [x] Other (please describe): Test coverage improvement (adds/extends
unit and integration tests to address Codecov-reported gaps)

test/testcases/test_web_api/test_memory_app/test_create_memory.py

@@ -20,8 +20,6 @@ import pytest
 from test_web_api.common import create_memory
 from configs import INVALID_API_TOKEN
 from libs.auth import RAGFlowWebApiAuth
-from hypothesis import example, given, settings
-from utils.hypothesis_utils import valid_names
 
 
 class TestAuthorization:
@@ -42,9 +40,7 @@ class TestAuthorization:
 
 class TestMemoryCreate:
     @pytest.mark.p1
-    @given(name=valid_names())
-    @example("d" * 128)
-    @settings(max_examples=20)
+    @pytest.mark.parametrize("name", ["test_memory_name", "d" * 128])
     def test_name(self, WebApiAuth, name):
         payload = {
             "name": name,
@@ -79,7 +75,7 @@ class TestMemoryCreate:
         assert res["message"] == expected_message, res
 
     @pytest.mark.p2
-    @given(name=valid_names())
+    @pytest.mark.parametrize("name", ["invalid_type_name", "memory_alpha"])
     def test_type_invalid(self, WebApiAuth, name):
         payload = {
             "name": name,

test/testcases/test_web_api/test_memory_app/test_update_memory.py

@@ -13,14 +13,14 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 #
+import re
+
 import pytest
 from test_web_api.common import update_memory
 from configs import INVALID_API_TOKEN
 from libs.auth import RAGFlowWebApiAuth
-from hypothesis import HealthCheck, example, given, settings
 from utils import encode_avatar
 from utils.file_utils import create_image_file
-from utils.hypothesis_utils import valid_names
 
 
 class TestAuthorization:
@@ -42,15 +42,14 @@ class TestAuthorization:
 class TestMemoryUpdate:
 
     @pytest.mark.p1
-    @given(name=valid_names())
-    @example("f" * 128)
-    @settings(max_examples=20, suppress_health_check=[HealthCheck.function_scoped_fixture])
+    @pytest.mark.parametrize("name", ["updated_memory", "f" * 128])
     def test_name(self, WebApiAuth, add_memory_func, name):
         memory_ids = add_memory_func
         payload = {"name": name}
         res = update_memory(WebApiAuth, memory_ids[0], payload)
         assert res["code"] == 0, res
-        assert res["data"]["name"] == name, res
+        pattern = rf"^{re.escape(name)}(?:\(\d+\))?$"
+        assert re.match(pattern, res["data"]["name"]), res
 
     @pytest.mark.p2
     @pytest.mark.parametrize(