Add custom emoticons to AI replies

Key features

• OffDo not use emoticons.
• The plug-in will convert it into the inline image of the current emoticon package on the Host side without additional model calls.
• The built-in and user-uploaded emoticons share 40 stable semantic keys, which can be switched at any time, and support four sizes: small, normal, large, and large.
• Transcription only works on plug-in markers and plug-in images, and does not affect Unicode emoji, codes, links, unknown tags or other Markdown images in ordinary text.