ci: leave OpenRouter test setup to tests

Author: danielkov

.github/workflows/release.yml

@@ -33,8 +33,6 @@ jobs:
       - run: cargo fmt --check
       - run: cargo clippy --locked --all-targets --all-features -- -D warnings
       - run: cargo test --locked
-        env:
-          OPENROUTER_API_KEY: ${{ secrets.OPENROUTER_API_KEY || 'ci-placeholder' }}
 
   linux-x64:
     needs: verify