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

metadata/dev.dettmer.simplenotes.yml

@@ -47,7 +47,23 @@ Builds:
     scandelete:
       - android/gradle/wrapper
 
+  - versionName: 1.2.0
+    versionCode: 5
+    commit: v1.2.0
+    subdir: android/app
+    sudo:
+      - apt-get update
+      - apt-get install -y openjdk-17-jdk-headless
+      - update-java-alternatives -a
+    gradle:
+      - fdroid
+    srclibs:
+      - reproducible-apk-tools@v0.2.8
+    prebuild: sed -i -e '/signingConfig/d' build.gradle.kts
+    scandelete:
+      - android/gradle/wrapper
+
 AutoUpdateMode: Version
 UpdateCheckMode: Tags
-CurrentVersion: 1.1.1
-CurrentVersionCode: 3
+CurrentVersion: 1.2.0
+CurrentVersionCode: 5