feat(role): remove admin authority check from getUserRole endpoint

- Removed @PreAuthorize annotation requiring 'admin' authority
- Made getUserRole endpoint publicly accessible
- Simplified role retrieval logic for all users

chaos_api_web/src/main/java/cn/nopj/chaos_api/controller/RoleController.java

@@ -34,7 +34,6 @@ public class RoleController {
     /**
      * 获取用户角色选项
      */
-    @PreAuthorize("hasAuthority('admin')")
     @GetMapping
     public ApiResult<List<OptionResponse>> getUserRole() {