fix(risk): add account_id field to OrderInfo for per-account risk tracking

Per-account circuit breaker and daily loss tracking was never applied to
real accounts because check_order() hardcoded "default". Added account_id
field to OrderInfo with backward-compatible None fallback. Updated all
construction sites across risk crate tests and integration tests.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

risk/src/compliance.rs

@@ -2010,6 +2010,7 @@ mod tests {
             order_type: Some(OrderType::Limit),
             portfolio_id: Some("test_portfolio".to_string()),
             strategy_id: Some("test_strategy".to_string()),
+            account_id: Some("test_account".to_string()),
         })
     }
 

risk/src/risk_types.rs

@@ -183,6 +183,8 @@ pub struct OrderInfo {
     pub portfolio_id: Option<String>,
     /// Trading strategy generating this order (if applicable)
     pub strategy_id: Option<String>,
+    /// Account ID for per-account risk tracking (None falls back to "default" with warning)
+    pub account_id: Option<String>,
 }
 
 /// Comprehensive Profit and Loss metrics for portfolio tracking

tests/risk_validation_tests.rs

@@ -49,6 +49,7 @@ fn create_test_order(symbol: &str, quantity: f64, price: f64) -> OrderInfo {
         order_type: Some(OrderType::Market),
         portfolio_id: Some(TEST_PORTFOLIO_ID.to_string()),
         strategy_id: None,
+        account_id: None,
     }
 }
 
@@ -319,6 +320,7 @@ fn test_order_info_type_conversions() {
         order_type: Some(OrderType::Market),
         portfolio_id: Some(TEST_PORTFOLIO_ID.to_string()),
         strategy_id: None,
+        account_id: None,
     };
 
     assert_eq!(order.quantity, quantity);