📝 docs(claude): add claude code section

- add "Claude Code" section to documentation
- specify requirement to always respond in Chinese

CLAUDE.md

@@ -83,4 +83,7 @@ Required environment variables:
 The project uses Roo framework for code generation and validation:
 - Commands in `.roo/commands/`
 - API-client validation rules
-- Entity-field mapping checks
+- Entity-field mapping checks
+
+## Claude Code
+- Always response in Chinese