Backtest replay adapter (回测回放适配层)

[Essential1220]

Add a lightweight replay adapter that feeds historical tick files through the same engine pipeline.

Not a full backtest engine — just replay recorded market data (binary/JSONL tick files from tick recording) through existing strategies for signal validation and parameter tuning.

Design

• Implement ReplayMdGateway conforming to IMdGateway
• Read tick files recorded by the existing tick recorder
• Configurable replay speed (1x, 10x, max)
• Output: strategy signals + simulated fills via paper-trading engine

Tasks

• ReplayMdGateway implementation
• CLI flag --replay <tick_file> to switch from live to replay mode
• Integrate with existing paper-trading engine for fill simulation
• Example: record 1 hour of SimNow ticks, then replay and compare signals