6bb87816f3
✨ New Features: - Local backup/restore system with 3 modes (Merge/Replace/Overwrite) - Markdown export for desktop access via WebDAV mount - Dual-format architecture (JSON master + Markdown mirror) - Settings UI extended with backup & desktop integration sections 📝 Changes: - Server restore now asks for mode selection (user safety) - WebDAV mount instructions for Windows/Mac/Linux in README - Complete CHANGELOG.md with all version history 🔧 Technical: - BackupManager.kt for complete backup/restore logic - Note.toMarkdown/fromMarkdown with YAML frontmatter - ISO8601 timestamps for desktop compatibility - Last-Write-Wins conflict resolution 📚 Documentation: - CHANGELOG.md (Keep a Changelog format) - README updates (removed Joplin/Obsidian, added WebDAV-mount) - F-Droid changelogs (DE+EN, under 500 chars) - SYNC_ARCHITECTURE.md in project-docs - MARKDOWN_DESKTOP_REALITY_CHECK.md strategic plan - WEB_EDITOR_PLAN_v1.3.0.md for future web editor feature