📝 docs(CLAUDE): update database access instructions

- clarify that database is in another container in the same container group
- update psql access command with additional context

CLAUDE.md

@@ -9,6 +9,6 @@
 
 - ### Claude Code
 - use pnpm
-- psql -h 127.0.0.1 -U postgres
+- 数据库在同一容器组的另一个容器中，需要运行 psql -h 127.0.0.1 -U postgres 来访问
 - bmad-core dir is in .bmad-core
 - Always response in Chinese