Fix: Issues and style fixes related to the 'Memory' page (#12469)

### What problem does this PR solve?

Fix:  Some bugs
- Issues and style fixes related to the 'Memory' page
- Data source icon replacement
- Build optimization

### Type of change

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

web/src/pages/dataset/dataset-setting/configuration/common-item.tsx

@@ -515,7 +515,6 @@ export function LLMModelItem({ line = 1, isEdit, label, name }: IProps) {
               })}
             >
               <FormLabel
-                required
                 tooltip={t('globalIndexModelTip')}
                 className={cn('text-sm  whitespace-wrap ', {
                   'w-1/4': line === 1,

web/src/pages/dataset/dataset-setting/form-schema.ts

@@ -96,7 +96,7 @@ export const formSchema = z
           )
           .optional(),
         enable_metadata: z.boolean().optional(),
-        llm_id: z.string().min(1, { message: 'Indexing model is required' }),
+        llm_id: z.string().optional(),
       })
       .optional(),
     pagerank: z.number(),