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',

web/src/services/orchestrator.js

@@ -7,20 +7,36 @@ export function runOrchestrator(payload) {
   })
 }
 
-export function fetchLatestConversation(userId) {
+export function fetchLatestConversation(userId, sessionType = '') {
   const params = new URLSearchParams({
     user_id: String(userId || '').trim()
   })
+  if (String(sessionType || '').trim()) {
+    params.set('session_type', String(sessionType || '').trim())
+  }
 
   return apiRequest(`/orchestrator/conversations/latest?${params.toString()}`)
 }
 
-export function clearUserConversations(userId) {
+export function clearUserConversations(userId, sessionType = '') {
   const params = new URLSearchParams({
     user_id: String(userId || '').trim()
   })
+  if (String(sessionType || '').trim()) {
+    params.set('session_type', String(sessionType || '').trim())
+  }
 
   return apiRequest(`/orchestrator/conversations?${params.toString()}`, {
     method: 'DELETE'
   })
 }
+
+export function deleteConversation(conversationId, userId) {
+  const params = new URLSearchParams({
+    user_id: String(userId || '').trim()
+  })
+
+  return apiRequest(`/orchestrator/conversations/${encodeURIComponent(String(conversationId || '').trim())}?${params.toString()}`, {
+    method: 'DELETE'
+  })
+}