Initial commit: Vault Dashboard for options hedging

- FastAPI + NiceGUI web application
- QuantLib-based Black-Scholes pricing with Greeks
- Protective put, laddered, and LEAPS strategies
- Real-time WebSocket updates
- TradingView-style charts via Lightweight-Charts
- Docker containerization
- GitLab CI/CD pipeline for VPS deployment
- VPN-only access configuration

app/models/__init__.py

@@ -0,0 +1,15 @@
+"""Application domain models."""
+
+from .option import Greeks, OptionContract, OptionMoneyness
+from .portfolio import LombardPortfolio
+from .strategy import HedgingStrategy, ScenarioResult, StrategyType
+
+__all__ = [
+    "Greeks",
+    "HedgingStrategy",
+    "LombardPortfolio",
+    "OptionContract",
+    "OptionMoneyness",
+    "ScenarioResult",
+    "StrategyType",
+]