feat: initial commit - EvoTraders project

量化交易多智能体系统，包含：
- 分析师、投资组合经理、风险经理等智能体
- 股票分析、投资组合管理、风险控制工具
- React 前端界面
- FastAPI 后端服务

Co-Authored-By: Claude <noreply@anthropic.com>

backend/config/env_config.py

@@ -0,0 +1,36 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+Simple environment config helpers
+"""
+import os
+
+
+def get_env_list(key: str, default: list = None) -> list:
+    """Get comma-separated list from env"""
+    value = os.getenv(key, "")
+    if not value:
+        return default or []
+    return [item.strip() for item in value.split(",") if item.strip()]
+
+
+def get_env_float(key: str, default: float = 0.0) -> float:
+    """Get float from env"""
+    value = os.getenv(key)
+    if value is None:
+        return default
+    try:
+        return float(value)
+    except ValueError:
+        return default
+
+
+def get_env_int(key: str, default: int = 0) -> int:
+    """Get int from env"""
+    value = os.getenv(key)
+    if value is None:
+        return default
+    try:
+        return int(value)
+    except ValueError:
+        return default