refactor: 重构 Tool Result 契约，移除 ui_hints 统一使用 result 字段

- ToolAgentOutput 移除 result_summary 和 ui_hints，统一使用 result 字段
- 日历/用户查找工具移除 ui_hints 输出，改为机器可读的结构化结果
- Agent History 移除 tool 消息的 ui_hints 处理逻辑
- App 版本检查改为 manifest.json 方式，支持多渠道发布
- 更新 settings 配置和测试用例适配新结构

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

@@ -311,3 +311,74 @@ async def test_enqueue_run_rejects_too_many_attachments(monkeypatch) -> None:
 
     assert exc_info.value.status_code == 422
     assert exc_info.value.detail == "Too many attachments"
+
+
+@pytest.mark.asyncio
+async def test_get_history_snapshot_filters_out_tool_messages() -> None:
+    class _HistoryRepository(_FakeRepository):
+        async def get_history_day(
+            self, *, session_id: str, before: date | None
+        ) -> dict[str, object] | None:
+            del session_id, before
+            return {
+                "day": "2026-03-17",
+                "hasMore": False,
+                "messages": [
+                    {
+                        "id": "00000000-0000-0000-0000-000000000111",
+                        "seq": 1,
+                        "role": "user",
+                        "content": "帮我查一下今天日程",
+                        "metadata": None,
+                        "timestamp": "2026-03-17T09:00:00Z",
+                    },
+                    {
+                        "id": "00000000-0000-0000-0000-000000000112",
+                        "seq": 2,
+                        "role": "tool",
+                        "content": "已获取日程列表，共 3 条",
+                        "metadata": {
+                            "run_id": "run-1",
+                            "tool_agent_output": {
+                                "tool_name": "calendar_read",
+                                "tool_call_id": "call-1",
+                                "status": "success",
+                                "result": "status=success total=3 returned=3",
+                            },
+                        },
+                        "timestamp": "2026-03-17T09:00:01Z",
+                    },
+                    {
+                        "id": "00000000-0000-0000-0000-000000000113",
+                        "seq": 3,
+                        "role": "assistant",
+                        "content": "今天共有 3 条日程。",
+                        "metadata": {
+                            "run_id": "run-1",
+                            "worker_agent_output": {
+                                "status": "success",
+                                "answer": "今天共有 3 条日程。",
+                                "key_points": [],
+                                "result_type": "summary",
+                                "suggested_actions": [],
+                            },
+                        },
+                        "timestamp": "2026-03-17T09:00:02Z",
+                    },
+                ],
+            }
+
+    service = AgentService(
+        repository=_HistoryRepository(),
+        queue=_FakeQueue(),
+        stream=_FakeStream(),
+        attachment_storage=_FakeAttachmentStorage(),
+    )
+
+    snapshot = await service.get_history_snapshot(
+        thread_id="00000000-0000-0000-0000-000000000001",
+        before=None,
+        current_user=_user(),
+    )
+
+    assert [message.role for message in snapshot.messages] == ["user", "assistant"]

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

@@ -16,21 +16,18 @@ class _FakeMessage:
         self.timestamp = datetime.now(timezone.utc)
 
 
-def test_convert_message_to_history_uses_ui_schema_key_for_tool_message() -> None:
+def test_convert_message_to_history_does_not_attach_ui_schema_for_tool_message() -> (
+    None
+):
     message = _FakeMessage(
         role="tool",
-        metadata={
-            "tool_agent_output": {
-                "ui_schema": {"version": "2.0", "root": {"type": "stack"}}
-            }
-        },
+        metadata={"tool_agent_output": {"result": "done"}},
     )
 
     result = convert_message_to_history(message)  # type: ignore[arg-type]
 
-    assert "ui_schema" in result
+    assert "ui_schema" not in result
     assert "uiSchema" not in result
-    assert result["ui_schema"] == {"version": "2.0", "root": {"type": "stack"}}
 
 
 def test_convert_message_to_history_uses_ui_schema_key_for_assistant_message() -> None: