chore: 更新项目配置

- 添加 gofmt 和 goimports 自动审批权限
- 添加 CLAUDE.md 项目指导文件，要求格式化 Go 源码

🤖 Generated with [Claude Code](https://claude.ai/code)

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

.claude/settings.local.json

@@ -9,7 +9,9 @@
       "Bash(go list:*)",
       "Bash(go test:*)",
       "Bash(rmdir:*)",
-      "Bash(rm:*)"
+      "Bash(rm:*)",
+      "Bash(gofmt:*)",
+      "Bash(goimports:*)"
     ],
     "deny": []
   }

CLAUDE.md

@@ -0,0 +1 @@
+- 要求每次修改完后,需要帮我格式化 Go 源码文件.