feat: 收敛知识库检索调度与评分语义

- 固定 rag.engine 与 Milvus 配置，补齐启动期检索基础设施校验

- 支持调用方配置 retrievalMode，并统一知识库检索入口与结果来源展示

- 修正关键词检索 knowledgeId 过滤、混合检索评分归一化与本地 ES 默认配置

easyflow-ui-admin/app/src/views/ai/documentCollection/KnowledgeSearch.vue

@@ -3,20 +3,40 @@ import { ref } from 'vue';
 
 import { $t } from '@easyflow/locales';
 
-import { ElButton, ElInput, ElMessage } from 'element-plus';
+import { ElButton, ElInput, ElMessage, ElOption, ElSelect } from 'element-plus';
 
 import { api } from '#/api/request';
 import PreviewSearchKnowledge from '#/views/ai/documentCollection/PreviewSearchKnowledge.vue';
 
+type RetrievalMode = 'HYBRID' | 'KEYWORD' | 'VECTOR';
+
+interface SearchResultItem {
+  sorting: number;
+  content: string;
+  score?: number;
+  hitSource?: 'BOTH' | 'KEYWORD' | 'VECTOR';
+  vectorScore?: number;
+  keywordScore?: number;
+}
+
 const props = defineProps({
   knowledgeId: {
     type: String,
     required: true,
   },
 });
-const searchDataList = ref([]);
+
+const searchDataList = ref<SearchResultItem[]>([]);
 const keyword = ref('');
+const retrievalMode = ref<RetrievalMode>('HYBRID');
 const previewSearchKnowledgeRef = ref();
+
+const retrievalModeOptions = [
+  { label: $t('bot.retrievalModes.hybrid'), value: 'HYBRID' },
+  { label: $t('bot.retrievalModes.vector'), value: 'VECTOR' },
+  { label: $t('bot.retrievalModes.keyword'), value: 'KEYWORD' },
+];
+
 const handleSearch = () => {
   if (!keyword.value) {
     ElMessage.error($t('message.pleaseInputContent'));
@@ -24,12 +44,22 @@ const handleSearch = () => {
   }
   previewSearchKnowledgeRef.value.loadingContent(true);
   api
-    .get(
-      `/api/v1/documentCollection/search?knowledgeId=${props.knowledgeId}&keyword=${keyword.value}`,
-    )
+    .get('/api/v1/documentCollection/search', {
+      params: {
+        knowledgeId: props.knowledgeId,
+        keyword: keyword.value,
+        retrievalMode: retrievalMode.value,
+      },
+    })
     .then((res) => {
-      previewSearchKnowledgeRef.value.loadingContent(false);
       searchDataList.value = res.data;
+    })
+    .catch(() => {
+      ElMessage.error($t('documentCollection.searchFailed'));
+      searchDataList.value = [];
+    })
+    .finally(() => {
+      previewSearchKnowledgeRef.value.loadingContent(false);
     });
 };
 </script>
@@ -40,7 +70,16 @@ const handleSearch = () => {
       <ElInput
         v-model="keyword"
         :placeholder="$t('common.searchPlaceholder')"
+        @keyup.enter="handleSearch"
       />
+      <ElSelect v-model="retrievalMode" class="retrieval-select">
+        <ElOption
+          v-for="item in retrievalModeOptions"
+          :key="item.value"
+          :label="item.label"
+          :value="item.value"
+        />
+      </ElSelect>
       <ElButton type="primary" @click="handleSearch">
         {{ $t('button.query') }}
       </ElButton>
@@ -48,6 +87,7 @@ const handleSearch = () => {
     <div class="search-result">
       <PreviewSearchKnowledge
         :data="searchDataList"
+        :retrieval-mode="retrievalMode"
         ref="previewSearchKnowledgeRef"
       />
     </div>
@@ -68,6 +108,12 @@ const handleSearch = () => {
   justify-content: space-between;
   gap: 12px;
 }
+
+.retrieval-select {
+  width: 180px;
+  flex-shrink: 0;
+}
+
 .search-result {
   padding-top: 20px;
   flex: 1;