Add user_prompt to WebUI

lightrag_webui/src/api/lightrag.ts

@@ -101,6 +101,8 @@ export type QueryRequest = {
   conversation_history?: Message[]
   /** Number of complete conversation turns (user-assistant pairs) to consider in the response context. */
   history_turns?: number
+  /** User-provided prompt for the query. If provided, this will be used instead of the default value from prompt template. */
+  user_prompt?: string
 }
 
 export type QueryResponse = {