feat: 企微回调服务基建（加解密+事件分发，默认关闭）

lib/runtime-env.ts

@@ -24,6 +24,9 @@ export type RuntimeEnv = {
   WECOM_ROBOT_WEBHOOK?: string;
   WECOM_NOTIFY_DUE_DAYS?: string;
   WECOM_NOTIFY_ENABLED?: string;
+  WECOM_CALLBACK_TOKEN?: string;
+  WECOM_CALLBACK_ENCODING_AES_KEY?: string;
+  WECOM_CALLBACK_ENABLED?: string;
   SEED_DEMO_DATA?: string;
   ENABLE_SCHEDULER?: string;
 };