feat: enhance index type handling and add error notification for missing embedding model (#16836)

web/i18n/en-US/app-debug.ts

@@ -483,6 +483,7 @@ const translation = {
       title: 'Multi-path retrieval',
       description: 'Based on user intent, queries across all Knowledge, retrieves relevant text from multi-sources, and selects the best results matching the user query after reranking.',
     },
+    embeddingModelRequired: 'A configured Embedding Model is required',
     rerankModelRequired: 'A configured Rerank Model is required',
     params: 'Params',
     top_k: 'Top K',

web/i18n/zh-Hans/app-debug.ts

@@ -475,6 +475,7 @@ const translation = {
       title: '多路召回',
       description: '根据用户意图同时匹配所有知识库，从多路知识库查询相关文本片段，经过重排序步骤，从多路查询结果中选择匹配用户问题的最佳结果。',
     },
+    embeddingModelRequired: '未配置 Embedding 模型',
     rerankModelRequired: '未配置 Rerank 模型',
     params: '参数设置',
     top_k: 'Top K',