feat: add vector retrieval API support

frontend/src/App.vue

@@ -1,9 +1,9 @@
 <script setup lang="ts">
 import { computed, onMounted, ref, watch } from 'vue'
 import { Activity, BookOpen, Bot, CheckCircle2, ChevronRight, Database, FileText, Globe2, Link2, MessageSquareText, Plus, Search, Send, ShieldCheck, Sparkles, AlertCircle } from 'lucide-vue-next'
-import { createKnowledge, createSource, getHealth, getKnowledge, getSources, retrieveKnowledge, type SourceItem } from './api'
+import { createKnowledge, createSource, getHealth, getKnowledge, getSources, retrieveKnowledge, retrieveVectorKnowledge, type SourceItem } from './api'
 type Page='chat'|'knowledge'|'sources'|'evaluation'
-const page=ref<Page>('chat'), apiStatus=ref('检测中'), question=ref(''), busy=ref(false), search=ref(''), showForm=ref(false), error=ref(''), notice=ref('')
+const page=ref<Page>('chat'), apiStatus=ref('检测中'), question=ref(''), busy=ref(false), retrievalMode=ref<'keyword'|'vector'>('keyword'), search=ref(''), showForm=ref(false), error=ref(''), notice=ref('')
 const messages=ref([{role:'assistant',content:'你好！我是边疆红驿文旅问答原型。当前后端仅为基础接口，尚未接入知识检索和大语言模型。'}] as {role:string;content:string;sources?:{title:string;source_url?:string|null}[]}[])
 const items=ref<any[]>([]), form=ref({title:'',category:'旅游资源',content:'',source_url:''})
 const sources=ref<SourceItem[]>([]), sourceSearch=ref(''), showSourceForm=ref(false), sourceForm=ref({name:'',source_url:'',notes:''})
@@ -15,7 +15,7 @@ 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{await getHealth();apiStatus.value='已连接'}catch{apiStatus.value='未连接'}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 retrieveKnowledge({query:q,top_k:5});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。':`已检索到 ${r.total_hits} 条已核验依据（${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=retrievalMode.value==='vector'?await retrieveVectorKnowledge({query:q,top_k:5}):await retrieveKnowledge({query:q,top_k:5});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${r.mode==='vector'?'向量':'关键词'}检索命中 ${r.total_hits} 条已核验依据（${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:'暂时无法连接检索服务。'})}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='';if(!form.value.title.trim()||!form.value.content.trim()){error.value='请填写知识标题和正文。';return}if(!validUrl(form.value.source_url)){error.value='来源网址必须是有效的 http(s) 地址。';return}try{await createKnowledge({...form.value,title:form.value.title.trim(),content:form.value.content.trim(),...(form.value.source_url?{source_url:form.value.source_url}:{})});form.value={title:'',category:'旅游资源',content:'',source_url:''};showForm.value=false;notice.value='已保存为待审核条目，尚未进入检索索引。';await refresh()}catch(e){error.value=e instanceof Error?e.message:'保存失败'}}
 </script>

frontend/src/api.ts

@@ -16,3 +16,6 @@ export type RetrievalResult={run_id:string;query:string;mode:'keyword';status:'o
 export function retrieveKnowledge(payload:{query:string;mode?:'keyword';top_k?:number;category?:string}){return apiRequest<RetrievalResult>('/api/retrieval',{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify(payload)})}
 export function getRetrievalRun(runId:string){return apiRequest<RetrievalResult>(`/api/retrieval/runs/${encodeURIComponent(runId)}`)}
 export function getRetrievalRuns(page=1,pageSize=20){return apiRequest<{items:RetrievalResult[];total:number;page:number;page_size:number}>(`/api/retrieval/runs?page=${page}&page_size=${pageSize}`)}
+
+export type VectorRetrievalResult=Omit<RetrievalResult,'mode'|'results'|'config'> & {mode:'vector';vector_version_id:string;text_index_version_id:string;generation:number;text_generation:number;results:(RetrievalHit & {chunk_id:string;chunk_ordinal:number})[];config:{scorer:'pgvector-cosine-exact-v1';ranking_unit:'chunk';space:{id:string;dimension:number}}}
+export function retrieveVectorKnowledge(payload:{query:string;top_k?:number;category?:string}){return apiRequest<VectorRetrievalResult>('/api/retrieval/vector',{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify({mode:'vector',top_k:5,...payload})})}