feat: add portfolio ownership model, auth guards, and migration

app/domain/services.py

@@ -27,12 +27,14 @@ class PortfolioDomainRepository(Protocol):
         status: str = "enabled",
         active_strategy_id: str | None = None,
         avabile_strategies: list[str] | None = None,
+        owner_user_id: str | None = None,
         initial_cash: float = 0.0,
     ) -> Portfolio: ...
     def create_portfolio(
         self,
         portfolio_id: str,
         *,
+        owner_user_id: str,
         broker: str,
         status: str,
         name: str,
@@ -45,7 +47,13 @@ class PortfolioDomainRepository(Protocol):
         avabile_strategies: list[str] | None,
     ) -> Portfolio: ...
     def update_portfolio(self, portfolio_id: str, **fields: object) -> Portfolio: ...
-    def list_portfolios(self, *, broker: str | None = None, status: str | None = None) -> list[Portfolio]: ...
+    def list_portfolios(
+        self,
+        *,
+        broker: str | None = None,
+        status: str | None = None,
+        owner_user_id: str | None = None,
+    ) -> list[Portfolio]: ...
     def get_strategy_set(self, id: str) -> StrategySet | None: ...
     def get_or_create_strategy_set(self, name: str, config: str) -> StrategySet: ...
     def save(
@@ -103,6 +111,7 @@ def apply_buy(
         status=portfolio.status,
         name=portfolio.name,
         symbol=portfolio.symbol,
+        owner_user_id=portfolio.owner_user_id,
         cash_balance=float(portfolio.cash_balance) - total_cost,
         asset_quantity=float(portfolio.asset_quantity) + quantity,
         price=price,
@@ -164,6 +173,7 @@ def apply_sell(
         status=portfolio.status,
         name=portfolio.name,
         symbol=portfolio.symbol,
+        owner_user_id=portfolio.owner_user_id,
         cash_balance=float(portfolio.cash_balance) + net_proceeds,
         asset_quantity=float(portfolio.asset_quantity) - quantity,
         price=price,