feat: add update chunk API endpoint and service method

frontend/src/api/endpoints.ts

@@ -29,6 +29,7 @@ const endpoints = {
     ADD_CHUNK: '/api/add_chunk',
     DELETE_CHUNK: (docId: string, chunkId: string) =>
       `/api/delete_chunk?id=${docId}&chunk_id=${chunkId}`,
+    UPDATE_CHUNK: '/api/update_chunk',
   },
   CONVERSATION: {
     ANSWER: '/api/answer',

frontend/src/api/services/userService.ts

@@ -57,6 +57,8 @@ const userService = {
     apiClient.post(endpoints.USER.ADD_CHUNK, data),
   deleteChunk: (docId: string, chunkId: string): Promise<any> =>
     apiClient.delete(endpoints.USER.DELETE_CHUNK(docId, chunkId)),
+  updateChunk: (data: any): Promise<any> =>
+    apiClient.put(endpoints.USER.UPDATE_CHUNK, data),
 };
 
 export default userService;