feat(agent): 增强多模态链路与工具调用能力

backend/tests/unit/v1/agent/test_repository.py

@@ -10,6 +10,31 @@ from models.agent_chat_message import AgentChatMessageRole
 from v1.agent.repository import AgentRepository
 
 
+class _ExecuteResult:
+    def __init__(self, value: object) -> None:
+        self._value = value
+
+    def scalar_one_or_none(self) -> object:
+        return self._value
+
+
+class _FakeSession:
+    def __init__(self, session_row: object) -> None:
+        self.session_row = session_row
+        self.added: list[object] = []
+        self.flushed = False
+
+    async def execute(self, stmt):  # noqa: ANN001
+        del stmt
+        return _ExecuteResult(self.session_row)
+
+    def add(self, obj: object) -> None:
+        self.added.append(obj)
+
+    async def flush(self) -> None:
+        self.flushed = True
+
+
 class _FakeToolResultStorage:
     def __init__(self, payload: dict[str, object] | None) -> None:
         self._payload = payload
@@ -104,3 +129,48 @@ async def test_user_message_snapshot_includes_renderable_attachments() -> None:
             "mimeType": "image/png",
         }
     ]
+
+
+@pytest.mark.asyncio
+async def test_persist_user_message_sets_session_title_when_empty() -> None:
+    session_id = str(uuid4())
+    session_row = SimpleNamespace(
+        message_count=0,
+        title=None,
+        last_activity_at=datetime.now(timezone.utc),
+    )
+    fake_session = _FakeSession(session_row)
+    repository = AgentRepository(session=fake_session)  # type: ignore[arg-type]
+
+    await repository.persist_user_message(
+        session_id=session_id,
+        run_id="run-1",
+        content_text="  请帮我安排明天下午开会  ",
+        metadata=None,
+    )
+
+    assert session_row.title == "请帮我安排明天下午开会"
+    assert session_row.message_count == 1
+    assert fake_session.flushed is True
+
+
+@pytest.mark.asyncio
+async def test_persist_user_message_keeps_existing_session_title() -> None:
+    session_id = str(uuid4())
+    session_row = SimpleNamespace(
+        message_count=1,
+        title="已有标题",
+        last_activity_at=datetime.now(timezone.utc),
+    )
+    fake_session = _FakeSession(session_row)
+    repository = AgentRepository(session=fake_session)  # type: ignore[arg-type]
+
+    await repository.persist_user_message(
+        session_id=session_id,
+        run_id="run-2",
+        content_text="新的消息内容",
+        metadata=None,
+    )
+
+    assert session_row.title == "已有标题"
+    assert session_row.message_count == 2