feat: 完善文档中心与报销申请交互及侧边栏重构

后端优化编排器报销查询和本体检测精度，增强报销单草稿保
存和附件回填逻辑，前端重构侧边栏组件支持折叠和图标导
航，完善文档中心状态筛选和详情提示，报销创建和审批详情
页优化会话管理和费用明细交互，新增助手应用服务和预设动
作工具函数，补充单元测试覆盖。

server/tests/test_agent_asset_service.py

@@ -497,7 +497,7 @@ def test_spreadsheet_change_records_include_all_modified_sheets() -> None:
 def test_editable_spreadsheet_onlyoffice_config_enables_forcesave(monkeypatch) -> None:
     with build_session() as db:
         monkeypatch.setattr(
-            "app.services.agent_assets.resolve_onlyoffice_settings",
+            "app.services.agent_asset_onlyoffice.resolve_onlyoffice_settings",
             lambda: OnlyOfficeRuntimeConfig(
                 enabled=True,
                 public_url="http://onlyoffice.example.com",