add constructor in config schema

src/config.ts

@@ -16,6 +16,9 @@ export class LocalSourceConfig
   extends PicSourceConfig
   implements LocalSourceConfigLike
 {
+  constructor(config: Partial<LocalSourceConfig>) {
+    super();
+  }
   @DefineSchema({ description: '目录路径', required: true })
   path: string;
   @DefineSchema({

src/index.ts

 import 'source-map-support/register';
 import { Context } from 'koishi';
 import { PicSourceLocalFSPlugin } from './plugin';
-import { PicSourceLocalFSPluginConfig, PicSourceLocalFSPluginConfigLike } from './config';
+import {
+  PicSourceLocalFSPluginConfig,
+  PicSourceLocalFSPluginConfigLike,
+} from './config';
 export * from './config';
 export * from './plugin';
 export * from './LocalSource';