🐛 v1.2.1: Markdown Initial Export Bugfix + URL Normalization + GitHub Workflow Fix

## 🐛 Fixed
- Initial Markdown export: Existing notes now exported when Desktop Integration activated
- Markdown directory structure: Files now land correctly in /notes-md/
- JSON URL normalization: Smart detection for both Root-URL and /notes-URL
- GitHub release notes: Fixed language order (DE primary, EN collapsible) and emoji

## ✨ Improved
- Settings UI: Example URL shows /notes instead of /webdav
- Server config: Enter only base URL (app adds /notes/ and /notes-md/ automatically)
- Flexible URL input: Both http://server/ and http://server/notes/ work
- Changelogs: Shortened for F-Droid 500 char limit

## 🔧 Technical
- getNotesUrl() helper with smart /notes/ detection
- getMarkdownUrl() simplified to use getNotesUrl()
- All JSON operations updated to use normalized URLs
- exportAllNotesToMarkdown() with progress callback
- Workflow: Swapped CHANGELOG_DE/EN, replaced broken emoji with 🌍

versionCode: 6
versionName: 1.2.1

QUICKSTART.en.md

@@ -76,7 +76,9 @@ ip addr show | grep "inet " | grep -v 127.0.0.1
    | **Password** | (your password from `.env`) |
    | **Gateway SSID** | Name of your WiFi network |
 
-4. **Press "Test connection"**
+   > **💡 Note:** Enter only the base URL (without `/notes`). The app automatically creates `/notes/` for JSON files and `/notes-md/` for Markdown export.
+
+4. **Press "Test connection"****
    - ✅ Success? → Continue to step 4
    - ❌ Error? → See [Troubleshooting](#troubleshooting)