Feat: metadata settings in KB. (#12662)

### What problem does this PR solve?

#11910

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

web/src/interfaces/database/knowledge.ts

@@ -68,6 +68,8 @@ export interface ParserConfig {
   topn_tags?: number;
   graphrag?: { use_graphrag?: boolean };
   enable_metadata?: boolean;
+  metadata?: any;
+  built_in_metadata?: Array<{ key: string; type: string }>;
 }
 
 export interface IKnowledgeFileParserConfig {