chore: 三个实盘模块加dotenv加载.env

live_executor/position_sync/risk_guard启动时自动加载backend/.env
确保TRADE_ENV/BINANCE_API_KEY/SECRET_KEY/PG_HOST等环境变量生效

backend/live_executor.py

@@ -11,6 +11,11 @@ Live Executor - 实盘交易执行模块
 
 import os
 import sys
+from pathlib import Path
+try:
+    from dotenv import load_dotenv; load_dotenv(Path(__file__).parent / ".env")
+except ImportError:
+    pass
 import json
 import time
 import logging

backend/position_sync.py

@@ -10,6 +10,11 @@ Position Sync - 仓位同步与对账模块
 import os
 import sys
 import json
+from pathlib import Path
+try:
+    from dotenv import load_dotenv; load_dotenv(Path(__file__).parent / ".env")
+except ImportError:
+    pass
 import time
 import logging
 import asyncio

backend/risk_guard.py

@@ -15,6 +15,11 @@ import os
 import sys
 import json
 import time
+from pathlib import Path
+try:
+    from dotenv import load_dotenv; load_dotenv(Path(__file__).parent / ".env")
+except ImportError:
+    pass
 import logging
 import asyncio
 import hashlib