Add custom instructions for zh-CN

Author: mrubens

.roo/rules-translate/instructions-zh-cn.md

@@ -0,0 +1,17 @@
+# Simplified Chinese (zh-CN) Translation Guidelines
+
+## Key Terminology
+
+| English Term    | Preferred (zh-CN)  | Avoid             |
+| --------------- | ------------------ | ----------------- |
+| auto-approve    | 自动批准           | 始终批准          |
+| tokens          | Token / Token 用量 | Tokens / 令牌     |
+| API cost        | API 费用           | API 成本          |
+| expand/collapse | 展开/收起          | 查看更多/查看更少 |
+
+## Formatting Rules
+
+- Add spaces between Chinese and English/numbers: "API 费用" (not "API费用")
+- Use proper spacing for ranges: "已使用: {{used}} / {{total}}" (not "已使用:{{used}}/{{total}}")
+- Use concise language for UI elements
+- Format complex instructions with bullet points