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/pages/agent/hooks/use-save-graph.ts

@@ -21,7 +21,7 @@ export const useSaveGraph = (showMessage: boolean = true) => {
   const saveGraph = useCallback(
     async (
       currentNodes?: RAGFlowNodeType[],
-      otherParam?: { gobalVariables: Record<string, GlobalVariableType> },
+      otherParam?: { globalVariables: Record<string, GlobalVariableType> },
     ) => {
       return setAgent({
         id,