Fixes: Added session variable types and modified configuration (#11269)

### What problem does this PR solve?

Fixes: Added session variable types and modified configuration

- Added more types of session variables
- Modified the embedding model switching logic in the knowledge base
configuration

### Type of change

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

web/src/utils/api.ts

@@ -49,6 +49,8 @@ export default {
   llm_tools: `${api_host}/plugin/llm_tools`,
 
   // knowledge base
+
+  check_embedding: `${api_host}/kb/check_embedding`,
   kb_list: `${api_host}/kb/list`,
   create_kb: `${api_host}/kb/create`,
   update_kb: `${api_host}/kb/update`,