feat(chat): 接入全局知识库上下文

tests/test_llm_streaming.py

@@ -3,7 +3,7 @@ from urllib import request
 
 import pytest
 
-from review_agent.llm import stream_reply
+from review_agent.llm import build_messages, stream_reply
 from review_agent.models import Conversation
 
 
@@ -39,3 +39,16 @@ def test_stream_reply_skips_malformed_sse_data(monkeypatch, settings, django_use
     chunks = list(stream_reply(conversation, "你好"))
 
     assert chunks == ["A", "B"]
+
+
+def test_build_messages_includes_knowledge_context(django_user_model):
+    user = django_user_model.objects.create_user(username="owner", password="pass")
+    conversation = Conversation.objects.create(user=user, title="会话")
+
+    messages = build_messages(conversation, "孙之烨是谁", knowledge_context="来源：简历\n孙之烨负责审核智能体项目。")
+
+    assert messages[0]["role"] == "system"
+    assert messages[1]["role"] == "system"
+    assert "全局知识库" in messages[1]["content"]
+    assert "孙之烨负责审核智能体项目" in messages[1]["content"]
+    assert messages[-1] == {"role": "user", "content": "孙之烨是谁"}