fix(community): install openssl and tar into helper

PRO install.sh calls openssl (line 102) for initial secrets and
tar to unpack the release; Alpine docker:*-cli ships neither.
Add them to apk/apt step plus early presence check for clearer log.

Co-authored-by: Cursor <cursoragent@cursor.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "amnezia-admin",
-  "version": "1.2.10",
+  "version": "1.2.11",
   "private": true,
   "description": "amnezia_web — базовая панель AmneziaWG (FREE: просмотр и удаление клиентов; полная версия — PRO).",
   "license": "MIT",