feat: implement hybrid database architecture and frontend encryption

- Add PostgreSQL + SQLite hybrid database support with automatic switching
- Implement frontend AES-GCM + RSA-OAEP encryption for sensitive data
- Add comprehensive DatabaseInterface with all required methods
- Fix compilation issues with interface consistency
- Update all database method signatures to use DatabaseInterface
- Add missing UpdateTraderInitialBalance method to PostgreSQL implementation
- Integrate RSA public key distribution via /api/config endpoint
- Add frontend crypto service with proper error handling
- Support graceful degradation between encrypted and plaintext transmission
- Add directory creation for RSA keys and PEM parsing fixes
- Test both SQLite and PostgreSQL modes successfully

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: tinkle-community <tinklefund@gmail.com>

trader/interface.go

@@ -36,9 +36,18 @@ type Trader interface {
 	// SetTakeProfit 设置止盈单
 	SetTakeProfit(symbol string, positionSide string, quantity, takeProfitPrice float64) error
 
+	// CancelStopLossOrders 仅取消止损单（修复 BUG：调整止损时不删除止盈）
+	CancelStopLossOrders(symbol string) error
+
+	// CancelTakeProfitOrders 仅取消止盈单（修复 BUG：调整止盈时不删除止损）
+	CancelTakeProfitOrders(symbol string) error
+
 	// CancelAllOrders 取消该币种的所有挂单
 	CancelAllOrders(symbol string) error
 
+	// CancelStopOrders 取消该币种的止盈/止损单（用于调整止盈止损位置）
+	CancelStopOrders(symbol string) error
+
 	// FormatQuantity 格式化数量到正确的精度
 	FormatQuantity(symbol string, quantity float64) (string, error)
 }