feat: autonomous trading engine — full implementation

- Database migration 018 with 13 tables for trading engine state
- Trading engine service (services/trading/) with 12 pure computation modules:
  position sizer, stop-loss manager, reserve pool, circuit breaker,
  risk tier controller, correlation matrix, tax lots, trading window,
  gradual entry, notifications, micro-trading, backtester
- Core TradingEngine with pre-trade evaluation pipeline and integration wiring
- FastAPI HTTP service with 14 endpoints (health, config, decisions, metrics, backtest)
- Performance tracker with Sharpe ratio, drawdown, profit factor computation
- 194 Python tests (165 property-based + 29 integration)
- Frontend: 13 TanStack Query hooks, 7 dashboard panels, tabbed Trading Engine page
- Helm chart entry, network policy, nginx proxy, ingress for trading-engine
- Shared infrastructure: enums, Redis keys, TradingConfig in AppConfig

frontend/src/api/client.ts

@@ -6,8 +6,9 @@
 const QUERY_API_BASE = import.meta.env.VITE_QUERY_API_URL || '';
 const SYMBOL_REGISTRY_BASE = import.meta.env.VITE_SYMBOL_REGISTRY_URL || '/registry';
 const RISK_ENGINE_BASE = import.meta.env.VITE_RISK_ENGINE_URL || '/risk';
+const TRADING_ENGINE_BASE = import.meta.env.VITE_TRADING_ENGINE_URL || '/trading';
 
-export type ApiBase = 'query' | 'registry' | 'risk';
+export type ApiBase = 'query' | 'registry' | 'risk' | 'trading';
 
 function baseUrl(api: ApiBase): string {
   switch (api) {
@@ -17,6 +18,8 @@ function baseUrl(api: ApiBase): string {
       return SYMBOL_REGISTRY_BASE;
     case 'risk':
       return RISK_ENGINE_BASE;
+    case 'trading':
+      return TRADING_ENGINE_BASE;
   }
 }