Add simple test job to verify runner

.gitlab-ci.yml

@@ -1,4 +1,5 @@
 stages:
+  - test
   - build-web
   - build-desktop
 
@@ -7,6 +8,17 @@ variables:
   npm_config_cache: "$CI_PROJECT_DIR/.npm"
   ELECTRON_CACHE: "$CI_PROJECT_DIR/.cache/electron"
 
+# Simple test job - NO TAGS - should run on any runner
+test:runner:
+  stage: test
+  image: alpine:latest
+  script:
+    - echo "✅ Runner is working!"
+    - echo "Runner can execute jobs successfully"
+    - ls -la
+  rules:
+    - if: '$CI_PIPELINE_SOURCE == "push"'
+
 # Cache node_modules and electron cache
 cache:
   key: ${CI_COMMIT_REF_SLUG}