Fix: Fixed the issue that similarity threshold modification in chat and search configuration failed #3221 (#9821)

### What problem does this PR solve?

Fix: Fixed the issue that similarity threshold modification in chat and
search configuration failed #3221

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

web/src/pages/next-chats/chat/app-settings/chat-settings.tsx

@@ -51,6 +51,7 @@ export function ChatSettings({ switchSettingVisible }: ChatSettingsProps) {
         cross_languages: [],
       },
       top_n: 8,
+      similarity_threshold: 0.2,
       vector_similarity_weight: 0.2,
       top_k: 1024,
       meta_data_filter: {

web/src/pages/next-chats/chat/app-settings/use-chat-setting-schema.tsx

@@ -4,7 +4,10 @@ import {
 } from '@/components/llm-setting-items/next';
 import { MetadataFilterSchema } from '@/components/metadata-filter';
 import { rerankFormSchema } from '@/components/rerank';
-import { vectorSimilarityWeightSchema } from '@/components/similarity-slider';
+import {
+  similarityThresholdSchema,
+  vectorSimilarityWeightSchema,
+} from '@/components/similarity-slider';
 import { topnSchema } from '@/components/top-n-item';
 import { useTranslate } from '@/hooks/common-hooks';
 import { z } from 'zod';
@@ -45,6 +48,7 @@ export function useChatSettingSchema() {
     ...LlmSettingEnabledSchema,
     llm_id: z.string().optional(),
     ...vectorSimilarityWeightSchema,
+    ...similarityThresholdSchema,
     ...topnSchema,
     ...MetadataFilterSchema,
   });