feat: initialize database with demo data on first run and update README

scripts/init_demo_db.py

@@ -32,6 +32,10 @@ except ImportError:
 
 def check_virtualenv():
     """Check if we're running in a virtual environment."""
+    # Skip virtualenv check in Docker containers
+    if os.getenv('INIT_DEMO_DB') == 'true':
+        return
+
     if not hasattr(sys, 'real_prefix') and not (hasattr(sys, 'base_prefix') and sys.base_prefix != sys.prefix):
         print("ERROR: Virtual environment not activated. Run:")
         print("  .venv\\Scripts\\Activate.ps1  (PowerShell)")