[IamJasonBian]

Summary

• Adds get_recent_orders() method to SafeCashBot that fetches filled/cancelled/failed/rejected orders from the last 7 days
• Includes them as recent_orders in the blob payload via log_state_to_blob
• Companion to Add historical orders list below Open Orders OptimChain/allocation-manager#33 which renders historical orders in the dashboard UI

Changes

• utils/safe_cash_bot.py — New get_recent_orders(days=7) method using the same symbol resolution and order-type mapping logic as get_open_orders()
• trading_system/main.py — Calls get_recent_orders() in run_once() and passes result to log_state_to_blob
• trading_system/state/blob_logger.py — Threads recent_orders through _serialize_state, _log_local, _log_remote, and log_state_to_blob

Test plan

• Dry-run the trading system and verify recent_orders appears in the local JSON state log
• Confirm the blob payload structure matches what the dashboard UI expects
• Verify no regressions when recent_orders is empty (no historical orders in window)