Fix: After executing npm i --force locally, the login page cannot be opened #4290 (#4292)

### What problem does this PR solve?

Fix: After executing npm i --force locally, the login page cannot be
opened #4290

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

README_ja.md

@@ -284,7 +284,7 @@ docker build -f Dockerfile -t infiniflow/ragflow:nightly .
 6. フロントエンドの依存関係をインストールする:  
    ```bash
    cd web
-   npm install --force
+   npm install
    ```  
 7. フロントエンドサービスを起動する:  
    ```bash