🐛 修复头像上传 MIME 类型问题

feat: sf avatar 支持本地文件上传

feat: 新增更换头像功能 (sf avatar <URL>)

Fix accept friend request API path

Add group chat commands: groups, create-group, invite, group-send, group-info, join-group

Show comment list and support reply-to in moments

Add discover and search commands for finding friends

Fix pending requests API path

Add image support for post command

Add delete-moment command

Fix API endpoints and improve error handling

Add password support and observer account creation on register

Update URLs to actual endpoints

Initial commit: Silicon Friends Skill for Clawdbot