feat(web): update composable and service

- useNavigation.js: update navigation composable
- services/orchestrator.js: update orchestrator service client

web/src/composables/useNavigation.js

@@ -40,11 +40,11 @@ export const navItems = [
   },
   {
     id: 'chat',
-    label: 'AI 助手',
-    navHint: '进入智能问答',
+    label: '财务知识问答',
+    navHint: '进入财务知识问答',
     icon: icons.message,
-    title: 'AI 财务助手',
-    desc: '围绕制度、票据、审批和差旅场景进行快速问答。'
+    title: '财务知识问答',
+    desc: '围绕制度、票据、审批、报销与财务规则进行快速问答。'
   },
   {
     id: 'policies',