Add Dashboard Autostart Setup for Windows

- start_dashboard.bat: Manual start with console output
- start_dashboard_silent.bat: Silent background start
- install_dashboard_autostart.bat: One-click autostart installation
- uninstall_dashboard_autostart.bat: Remove autostart
- DASHBOARD_AUTOSTART_SETUP.md: Complete documentation

Features:
- Automatic startup on Windows login
- Opens browser at http://localhost:8501
- Silent background execution
- Easy install/uninstall
- Troubleshooting guide included

start_dashboard_silent.bat

@@ -0,0 +1,19 @@
+@echo off
+REM ==========================================
+REM Trading Bot Dashboard - Silent Autostart
+REM Startet im Hintergrund ohne Fenster
+REM ==========================================
+
+REM Wechsel ins Bot-Verzeichnis
+cd /d "%~dp0"
+
+REM Starte Dashboard im Hintergrund (headless)
+start /B pythonw -m streamlit run trading_dashboard.py --server.port 8501 --server.headless true
+
+REM Warte 5 Sekunden
+timeout /t 5 /nobreak >nul
+
+REM Öffne Browser
+start http://localhost:8501
+
+exit