Simplify to memory system api

tests/test_memory_system_clients.py

@@ -0,0 +1,33 @@
+from memory_system_api.clients import EverOSMemorySystemClient
+
+
+def test_everos_assistant_payload_does_not_use_user_id_as_sender():
+    client = EverOSMemorySystemClient()
+
+    payload = client.build_message_payload(
+        user_id="tom",
+        session_id="sess-1",
+        role="assistant",
+        content="我记住了",
+    )
+
+    message = payload["messages"][0]
+    assert message["role"] == "assistant"
+    assert message["sender_id"] != "tom"
+    assert message["sender_name"] != "tom"
+
+
+def test_everos_user_payload_uses_user_id_as_sender():
+    client = EverOSMemorySystemClient()
+
+    payload = client.build_message_payload(
+        user_id="tom",
+        session_id="sess-1",
+        role="user",
+        content="我喜欢拿铁",
+    )
+
+    message = payload["messages"][0]
+    assert message["role"] == "user"
+    assert message["sender_id"] == "tom"
+    assert message["sender_name"] == "tom"