ci: switch to shell executor for GitLab Runner

Remove Docker image references since runner uses shell executor
with Node.js installed directly on VPS.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitlab-ci.yml

@@ -3,9 +3,8 @@ stages:
   - build
   - deploy
 
-# Шаблон: Node.js 22 + кэш node_modules
+# Шаблон: установка зависимостей + кэш (shell executor, Node.js на VPS)
 .node_setup:
-  image: node:22-alpine
   before_script:
     - npm ci --prefer-offline
   cache:
@@ -38,11 +37,9 @@ build:
 # Deploy — только при push в main
 deploy_production:
   stage: deploy
-  image: node:22-alpine
   dependencies:
     - build
   before_script:
-    - apk add --no-cache openssh-client
     - eval $(ssh-agent -s)
     - echo "$SSH_PRIVATE_KEY" | tr -d '\r' | ssh-add -
     - mkdir -p ~/.ssh