fix(config): support Redis ACL username

deploy/.env.example

@@ -176,6 +176,8 @@ DATABASE_CONN_MAX_IDLE_TIME_MINUTES=5
 # -----------------------------------------------------------------------------
 # Redis 监听端口（同时用于应用连接和 Redis 服务端，默认 6379）
 REDIS_PORT=6379
+# Redis ACL username; leave empty for the default user
+REDIS_USERNAME=
 # Leave empty for no password (default for local development)
 REDIS_PASSWORD=
 REDIS_DB=0