docs: synchronize bilingual user guides
docs(wiki): Explain help search and image paste fixes Synchronize English and Simplified Chinese guides from termgram 32ad70ae8315ed1c89733f5a8d1e8058ef8bb092, including username rendering and Ghostty Cmd-V behavior.
docs(wiki): Publish commands and daily messaging guides Publish the 39 English and Simplified Chinese guide pages from source 478ccc7040b94acbd02be916158ca6f837b33765, including commands, drafts and media paste, editing/sharing, notifications, polls/reactions, chat discovery and atomic configuration reload. Retain source revision links and update the sidebar. Validate exported internal links and both languages.