* fix(feishu): keep attachments sent with post messages
* fix(feishu): keep user-typed file placeholders and malformed files arrays from losing attachments
* test(feishu): pin mixed inline attachment behavior and consume the post file count
* fix(feishu): parse post commands before adding attachment placeholders
---------
Co-authored-by: Willem Jiang <willem.jiang@gmail.com>
Co-authored-by: Totoro <msy626836554@gmail.com>