Add a Chinese ROADMAP

ROADMAP.zh-CN.md mirrors ROADMAP.md section by section, using the same
Chinese terms as the app and README. The English and Chinese roadmaps
link to each other, and the Chinese README links to the Chinese roadmap.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Author: CanYouTeachMeHowToCode

README.zh-CN.md

@@ -205,7 +205,7 @@ V3 把单用户的本地应用，变成可以供多名玩家使用、每人数
 
 ## 未来方向
 
-完整计划见 [ROADMAP.md](ROADMAP.md)。简要来说：
+完整计划见 [ROADMAP.zh-CN.md](ROADMAP.zh-CN.md)（[English](ROADMAP.md)）。简要来说：
 
 ```text
 V1  是什么打败了我？         → 手动记录的尝试分析

ROADMAP.md

@@ -1,5 +1,7 @@
 # Sekiro Boss Practice Analytics — Roadmap
 
+English | [简体中文](ROADMAP.zh-CN.md)
+
 This roadmap defines the planned evolution of **Sekiro Boss Practice Analytics**.
 
 The project began as a lightweight manual boss-attempt tracker, but development exposed an important constraint: