Fix Docker deployment issues and add fresh database support

- Fix: Add missing 'click' import to app.py to resolve startup error
- Fix: Update docker-compose.yml volume mappings to use correct persistent storage paths (/opt/digi-s)
- Improve: Enhanced entrypoint.sh for better database initialization
- Update: Configuration files for improved deployment

This resolves the Docker container startup issues and ensures proper persistent storage.

entrypoint.sh

@@ -9,6 +9,10 @@ mkdir -p instance
 if [ ! -f instance/dashboard.db ]; then
     echo "No database found, initializing..."
     
+    # Remove and recreate migrations directory to ensure clean state
+    rm -rf migrations
+    mkdir -p migrations
+    
     # Initialize the database
     flask db init
     flask db migrate -m "Initial migration"