Release v1.2.0 - Local Backup & Markdown Desktop Integration

✨ 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

fastlane/metadata/android/de-DE/changelogs/5.txt

@@ -0,0 +1,13 @@
+v1.2.0 - Backup & Desktop-Integration
+
+🆕 Lokales Backup/Restore
+• Exportiere alle Notizen als JSON
+• 3 Wiederherstellungs-Modi (Merge/Replace/Overwrite)
+• Auto-Backup vor Restore
+
+🆕 Markdown Desktop-Integration (optional)
+• .md Export für Desktop-Editoren (WebDAV-Mount)
+• Last-Write-Wins Sync
+• Manueller Import
+
+📚 Sync-Architektur Doku

fastlane/metadata/android/en-US/changelogs/5.txt

@@ -0,0 +1,13 @@
+v1.2.0 - Backup & Desktop Integration
+
+🆕 Local Backup/Restore
+• Export all notes as JSON
+• 3 restore modes (Merge/Replace/Overwrite)
+• Auto-backup before restore
+
+🆕 Markdown Desktop Integration (optional)
+• .md export for desktop editors (WebDAV mount)
+• Last-Write-Wins sync
+• Manual import
+
+📚 Sync architecture docs