feat: update auto reply and packaging

helper/auto_reply_knowledge.go

@@ -162,9 +162,18 @@ func (e *AutoReplyEngine) rebuildKnowledgeIndex() (*KnowledgeIndex, error) {
 		return nil, err
 	}
 	e.updateKnowledgeStatus(idx)
-	if err := e.rebuildEmbeddingIndex(idx); err != nil {
-		e.setLastErrorWithScope(autoReplyErrorScopeKnowledge, err.Error())
+	if requiresEmbeddingIndex(cfg.Retrieval.RetrievalMode) {
+		if err := e.rebuildEmbeddingIndex(idx); err != nil {
+			e.setLastErrorWithScope(autoReplyErrorScopeKnowledge, err.Error())
+			return idx, err
+		}
+		if len(idx.Chunks) > 0 && e.embeddingEntryCount() == 0 {
+			err := fmt.Errorf("向量索引为空，请先重建知识库索引")
+			e.setLastErrorWithScope(autoReplyErrorScopeKnowledge, err.Error())
+			return idx, err
+		}
 	}
+	e.clearLastErrorScope(autoReplyErrorScopeKnowledge)
 	return idx, nil
 }
 
@@ -206,6 +215,19 @@ func (e *AutoReplyEngine) updateKnowledgeStatus(idx *KnowledgeIndex) {
 	e.mu.Unlock()
 }
 
+func (e *AutoReplyEngine) embeddingEntryCount() int {
+	e.mu.Lock()
+	defer e.mu.Unlock()
+	if e.embeddingIndex == nil {
+		return 0
+	}
+	return len(e.embeddingIndex.Entries)
+}
+
+func requiresEmbeddingIndex(mode string) bool {
+	return strings.TrimSpace(mode) != retrievalModeKeywordOnly
+}
+
 func scoreKnowledgeChunk(queryTokens map[string]int, chunk KnowledgeChunk) float64 {
 	textTokens := tokenizeKnowledgeText(chunk.Title + " " + chunk.Content)
 	if len(textTokens) == 0 {