📝 docs(claude): update documentation structure and content

- add "Claude Code" section to organize related instructions
- fix formatting by adding proper line breaks
- clarify instruction: "always response in chinese" → "Always response in Chinese" with capitalization

CLAUDE.md

@@ -74,4 +74,6 @@ This is a full-stack TypeScript application using:
 - SSR (Server-Side Rendering) setup with Hono.js
 - Environment variables via `.env` file
 - Port 8080 for development and production
-- always response in chinese
+
+## Claude Code
+- Always response in Chinese