feat(notify): 支持钉钉多群推送 & 添加轮动策略核心逻辑文档

- settings.py: 新增 get_all_dingtalk_configs() 自动扫描所有钉钉群配置
- notify.py: 新增 send_to_all_groups() 多群推送函数
- daily_scheduler.py: 报告和错误通知改用多群推送
- .env: 添加第二个钉钉群配置 (DINGTALK_WEBHOOK_2/SECRET_2)
- 轮动策略核心逻辑.md: 策略核心逻辑总结文档

config/settings.py

@@ -27,13 +27,29 @@ DATA_CACHE_DIR.mkdir(exist_ok=True)
 
 # ==================== 钉钉配置 ====================
 def get_dingtalk_config() -> dict:
-    """从环境变量获取钉钉配置"""
+    """从环境变量获取钉钉配置（默认群1）"""
     return {
         "webhook": os.getenv("DINGTALK_WEBHOOK", ""),
         "secret": os.getenv("DINGTALK_SECRET", ""),
     }
 
 
+def get_all_dingtalk_configs() -> list[dict]:
+    """获取所有已配置的钉钉群配置列表"""
+    configs = []
+    # 群1（主群）
+    cfg1 = get_dingtalk_config()
+    if cfg1["webhook"]:
+        configs.append(cfg1)
+    # 群2 及后续扩展：DINGTALK_WEBHOOK_2, _3, ...
+    for i in range(2, 10):
+        webhook = os.getenv(f"DINGTALK_WEBHOOK_{i}", "")
+        secret = os.getenv(f"DINGTALK_SECRET_{i}", "")
+        if webhook:
+            configs.append({"webhook": webhook, "secret": secret})
+    return configs
+
+
 # ==================== 数据库配置 ====================
 def get_db_config() -> dict:
     """从环境变量获取数据库配置"""