im (v1) CRITICAL — 开始前 MUST 先用 Read 工具读取 ,其中包含认证、权限处理 Core Concepts - Message : A single message in a chat, identified by (om xxx). Supports types: text, post, image, file, audio, video, sticker, interactive (card), share chat, share user, merge forward, etc. - Chat : A group chat or P2P conversation, identified by (oc xxx). - Thread : A reply thread under a message, identified by (om xxx or omt xxx). - Reaction : An emoji reaction on a message. - Flag : A bookmark on a message or thread. - Feed Shortcut : A chat pinned to the current user's feed sidebar, identified by (an open chat id for CH…