feat: 报销预审会话状态管理与工作台交互增强

- 新增差旅报销会话状态管理与对话模型重构
- 增强风险观测服务与运行时聊天上下文作用域
- 优化工作台图标资源、助理意图识别与摘要工具
- 完善报销创建视图样式与差旅详情页标准调整交互
- 补充风险观测、运行时聊天与报销端点测试覆盖

server/src/app/api/v1/router.py

@@ -22,6 +22,7 @@ from app.api.v1.endpoints.receipt_folder import router as receipt_folder_router
 from app.api.v1.endpoints.reimbursements import router as reimbursements_router
 from app.api.v1.endpoints.risk_observations import router as risk_observations_router
 from app.api.v1.endpoints.settings import router as settings_router
+from app.api.v1.endpoints.steward import router as steward_router
 from app.api.v1.endpoints.system_logs import router as system_logs_router
 
 router = APIRouter()
@@ -47,4 +48,5 @@ router.include_router(employee_profiles_router, tags=["employee-profiles"])
 router.include_router(reimbursements_router, prefix="/reimbursements", tags=["reimbursements"])
 router.include_router(risk_observations_router, tags=["risk-observations"])
 router.include_router(settings_router, tags=["settings"])
+router.include_router(steward_router, tags=["steward"])
 router.include_router(system_logs_router, tags=["system-logs"])