Add a complete Edge extension under edge/ (manifest, popup, CSS, JS, locales, assets, LICENSE) and a change.log. Update README with Edge/mobile notes and simplify content. Update GitHub Actions workflow to read edge/manifest.json version, package Edge builds, and include Edge asset in the release summary (also bump default release_tag). Minor update to firefox/js/oper.js and include .DS_Store change.
Update README.md to replace the previous "等待上架" Firefox status with the actual add-on URL (审核中): https://addons.mozilla.org/zh-CN/firefox/addon/memos-bber/. Add macOS .DS_Store metadata files at repository root and firefox/ (binary files).
jonny