🧹 删除接口定义

使用抽象类，减少文件体积

extend/api.js

@@ -1,2 +0,0 @@
-"use strict";
-Object.defineProperty(exports, "__esModule", { value: true });

extend/api.ts

@@ -1,16 +0,0 @@
-interface Command {
-  Initialize(): void;
-
-  Prompting(): void;
-
-  Writing(): void;
-
-  Installing(): void;
-
-  Ending(): void;
-}
-
-interface Console {
-}
-
-export { Command, Console };