fix(deploy): конфиг в /opt/security-alert-center/config (sac:sac)

Убирает ошибку Permission denied при каталоге /etc root:root.

deploy/README.md

@@ -3,7 +3,7 @@
 ## Production (native) — основной путь
 
 1. [docs/install-ubuntu-24.04-native.md](../docs/install-ubuntu-24.04-native.md)
-2. `deploy/env.native.example` → `/etc/security-alert-center/sac-api.env`
+2. `deploy/env.native.example` → `/opt/security-alert-center/config/sac-api.env`
 3. `deploy/systemd/sac-api.service` → `/etc/systemd/system/`
 4. `deploy/nginx/sac.conf.example` → `/etc/nginx/sites-available/sac`