feat: refactor portfolio strategy references

docs/portfoliohub-spec.md

@@ -224,6 +224,8 @@ Base routes:
 - `symbol: str`
 - `strategy_name: str = "target_value"`
 - `strategy_params: object = {}`
+- `active_strategy_id: str | null`
+- `avabile_strategies: string[] | null`
 - `cash_balance: float >= 0`
 - `asset_quantity: float >= 0`
 - `asset_price: float >= 0`
@@ -236,6 +238,8 @@ Base routes:
 - `symbol: str | null`
 - `strategy_name: str | null`
 - `strategy_params: object | null`
+- `active_strategy_id: str | null`
+- `avabile_strategies: string[] | null`
 - `asset_price: float >= 0 | null`
 
 `BuyRequest` / `SellRequest`
@@ -268,6 +272,22 @@ Base routes:
 
 - Includes portfolio summary fields and computed `total_value`
 
+`PortfolioSummary`
+
+- `portfolio_id: str`
+- `broker: str`
+- `status: str`
+- `symbol: str`
+- `cash_balance: float`
+- `asset_quantity: float`
+- `price: float`
+- `profit_buffer: float`
+- `active_strategy_id: str | null`
+- `avabile_strategies: string[] | null`
+- `created_at: datetime | null`
+- `updated_at: datetime | null`
+- `last_trade_at: datetime | null`
+
 `PortfolioDetailResponse`
 
 - `portfolio: PortfolioSummary`