Fix CTP exchange routing for non-SHFE contracts and duplicate trade closes.

Resolve CZCE/DCE symbols to the correct exchange for orders, dedupe stop-loss closes and trade logs, and rely on CTP sync for authoritative records.

Co-authored-by: Cursor <cursoragent@cursor.com>

ctp_trade_sync.py

@@ -16,7 +16,7 @@ from contract_specs import calc_position_metrics
 from ctp_symbol import ths_to_vnpy_symbol
 from fee_specs import calc_round_trip_fee
 from symbols import ths_to_codes
-from trade_log_lib import calc_equity_after, ensure_trade_log_columns
+from trade_log_lib import calc_equity_after, purge_duplicate_local_trade_logs, ensure_trade_log_columns
 from vnpy_bridge import ctp_list_trades, ctp_status
 
 logger = logging.getLogger(__name__)
@@ -292,4 +292,7 @@ def sync_trade_logs_from_ctp(
             refresh_stats_cache(conn, capital)
         except Exception as exc:
             logger.debug("stats refresh after ctp trade sync: %s", exc)
+    purged = purge_duplicate_local_trade_logs(conn)
+    if purged:
+        stats["purged"] = purged
     return stats