feat: add local history and error pages

frontend/src/App.vue

@@ -4,6 +4,7 @@ import { Activity, BookOpen, Bot, CheckCircle2, ChevronRight, Database, FileText
 import { createKnowledge, createSource, getHealth, getKnowledge, getSources, type SourceItem } from './api'
 import { retrieveHybrid } from './services/hybrid'
 import { getCurrentUser } from './services/auth'
+import { saveLocalHistory } from './services/localHistory'
 import { useRouter } from 'vue-router'
 import type { SessionUser } from './types/auth'
 type Page='chat'|'knowledge'|'sources'|'evaluation'
@@ -20,7 +21,7 @@ async function saveSource(){error.value='';notice.value='';if(!sourceForm.value.
 let sourceSearchTimer:number|undefined
 watch(sourceSearch,()=>{window.clearTimeout(sourceSearchTimer);sourceSearchTimer=window.setTimeout(refreshSources,260)})
 onMounted(async()=>{try{currentUser.value=await getCurrentUser()}catch{router.replace('/login');return}try{await getHealth();apiStatus.value='已连接'}catch{apiStatus.value='未连接'}if(currentUser.value.role==='admin')await Promise.all([refresh(),refreshSources()])})
-async function send(){const q=question.value.trim();if(!q||busy.value)return;messages.value.push({role:'user',content:q});question.value='';busy.value=true;try{const r=await retrieveHybrid({query:q,top_k:5,candidate_k:50});const content=r.status==='no_evidence'?'未检索到可用的已核验知识依据。请调整问题或补充审核后的资料。':`已通过 RRF 混合检索命中 ${r.total_hits} 条依据（关键词 ${r.lexical_total_hits}，向量 ${r.vector_total_hits}，${r.elapsed_ms.toFixed(1)} ms）。当前仅展示检索证据，尚未接入大语言模型生成回答。`;messages.value.push({role:'assistant',content,sources:r.results.map(hit=>({title:`${hit.title}：${hit.snippet}`,source_url:hit.source_url}))})}catch(e){messages.value.push({role:'assistant',content:e instanceof Error?e.message:'暂时无法连接混合检索服务。'})}finally{busy.value=false}}
+async function send(){const q=question.value.trim();if(!q||busy.value)return;messages.value.push({role:'user',content:q});question.value='';busy.value=true;try{const r=await retrieveHybrid({query:q,top_k:5,candidate_k:50});const content=r.status==='no_evidence'?'未检索到可用的已核验知识依据。请调整问题或补充审核后的资料。':`已通过 RRF 混合检索命中 ${r.total_hits} 条依据（关键词 ${r.lexical_total_hits}，向量 ${r.vector_total_hits}，${r.elapsed_ms.toFixed(1)} ms）。当前仅展示检索证据，尚未接入大语言模型生成回答。`;messages.value.push({role:'assistant',content,sources:r.results.map(hit=>({title:`${hit.title}：${hit.snippet}`,source_url:hit.source_url}))});saveLocalHistory(q,content)}catch(e){const content=e instanceof Error?e.message:'暂时无法连接混合检索服务。';messages.value.push({role:'assistant',content});saveLocalHistory(q,content)}finally{busy.value=false}}
 function validUrl(value:string){try{if(value)new URL(value);return true}catch{return false}}
 async function save(){
   error.value='';notice.value=''

frontend/src/router.ts

@@ -8,6 +8,8 @@ const router=createRouter({history:createWebHistory(),routes:[
   {path:'/',component:App},
   {path:'/login',component:()=>import('./views/LoginView.vue'),meta:{public:true}},
   {path:'/register',component:()=>import('./views/RegisterView.vue'),meta:{public:true}},
+  {path:'/403',component:()=>import('./views/ForbiddenView.vue'),meta:{public:true}},
+  {path:'/history',component:()=>import('./views/HistoryView.vue')},
   {path:'/profile',component:()=>import('./views/ProfileView.vue')},
   {path:'/settings',component:()=>import('./views/AccountSettingsView.vue')},
   {path:'/indexes',component:()=>import('./views/IndexManagementView.vue'),meta:{role:'admin'}},
@@ -17,6 +19,7 @@ const router=createRouter({history:createWebHistory(),routes:[
   {path:'/sources',component:()=>import('./views/SourceManagementView.vue'),meta:{role:'admin'}},
   {path:'/retrieval-exports',component:()=>import('./views/RetrievalExportView.vue'),meta:{role:'admin'}},
   {path:'/admin',component:()=>import('./views/AdminView.vue'),meta:{role:'admin'}},
+  {path:'/:pathMatch(.*)*',component:()=>import('./views/NotFoundView.vue'),meta:{public:true}},
 ]})
-router.beforeEach(async to=>{if(to.meta.public)return true;try{role=(await getCurrentUser()).role}catch{return {path:'/login',query:{redirect:to.fullPath}}}if(to.meta.role&&role!==to.meta.role)return {path:'/profile',query:{forbidden:'1'}};return true})
+router.beforeEach(async to=>{if(to.meta.public)return true;try{role=(await getCurrentUser()).role}catch{return {path:'/login',query:{redirect:to.fullPath}}}if(to.meta.role&&role!==to.meta.role)return {path:'/403'};return true})
 export default router

frontend/src/services/localHistory.ts

@@ -0,0 +1,6 @@
+export type LocalHistoryItem={id:string;question:string;summary:string;created_at:string}
+const key='nalati-local-history-v1'
+export function readLocalHistory():LocalHistoryItem[]{try{const value=JSON.parse(sessionStorage.getItem(key)||'[]');return Array.isArray(value)?value:[]}catch{return []}}
+export function saveLocalHistory(question:string,summary:string){const item:LocalHistoryItem={id:crypto.randomUUID(),question,summary,created_at:new Date().toISOString()};sessionStorage.setItem(key,JSON.stringify([item,...readLocalHistory()].slice(0,100)))}
+export function removeLocalHistory(id:string){sessionStorage.setItem(key,JSON.stringify(readLocalHistory().filter(item=>item.id!==id)))}
+export function clearLocalHistory(){sessionStorage.removeItem(key)}

frontend/src/views/ForbiddenView.vue

@@ -0,0 +1 @@
+<template><main><h1>403 无权限</h1><p>当前账户没有访问此页面的权限。管理员能力仍必须由后端授权。</p><RouterLink to="/">返回首页</RouterLink></main></template>

frontend/src/views/HistoryView.vue

@@ -0,0 +1,10 @@
+<script setup lang="ts">
+import { computed, ref } from 'vue'
+import { clearLocalHistory, readLocalHistory, removeLocalHistory, type LocalHistoryItem } from '../services/localHistory'
+const items=ref<LocalHistoryItem[]>(readLocalHistory()),selected=ref<LocalHistoryItem>()
+const empty=computed(()=>!items.value.length)
+function refresh(){items.value=readLocalHistory()}
+function remove(id:string){removeLocalHistory(id);if(selected.value?.id===id)selected.value=undefined;refresh()}
+function clear(){if(window.confirm('确定清除本浏览器的全部本地对话记录吗？')){clearLocalHistory();selected.value=undefined;refresh()}}
+</script>
+<template><main><RouterLink to="/">返回智能问答</RouterLink><h1>历史对话</h1><p>当前记录仅保存在本浏览器，尚未接入服务器持久化；清除浏览器数据后可能丢失。</p><button :disabled="empty" @click="clear">清除全部本地记录</button><p v-if="empty">暂无本地记录。请先在智能问答页发起提问。</p><table v-else><thead><tr><th>问题</th><th>时间</th><th>操作</th></tr></thead><tbody><tr v-for="item in items" :key="item.id"><td>{{item.question}}</td><td>{{new Date(item.created_at).toLocaleString()}}</td><td><button @click="selected=item">查看</button><button @click="remove(item.id)">删除</button></td></tr></tbody></table><section v-if="selected"><h2>{{selected.question}}</h2><p>{{selected.summary}}</p></section></main></template>

frontend/src/views/NotFoundView.vue

@@ -0,0 +1 @@
+<template><main><h1>404 页面不存在</h1><p>请检查地址，或返回智能问答首页。</p><RouterLink to="/">返回首页</RouterLink></main></template>