docs: add Japanese README

fdad5595 · Ikko Ashimine · 0f033930 · fdad5595 · fdad5595 · fdad5595
Commit fdad5595 authored Mar 25, 2026 by Ikko Ashimine
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@

 **AI API Gateway Platform for Subscription Quota Distribution**

-English | [中文](README_CN.md)
+English | [中文](README_CN.md) | [日本語](README_JA.md)

 </div>


--- a/README_CN.md
+++ b/README_CN.md
@@ -12,7 +12,7 @@

 **AI API 网关平台 - 订阅配额分发管理**

-[English](README.md) | 中文
+[English](README.md) | 中文 | [日本語](README_JA.md)

 </div>


--- a/README_JA.md
+++ b/README_JA.md