Increase Node heap limit for CI check step

oxc-parser (used by Knip) fails with ArrayBuffer allocation
error on the CI runner's default heap size. Set max-old-space-size
to 2048MB to accommodate the buffer allocation.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -21,6 +21,8 @@ jobs:
 
       - run: pnpm install --frozen-lockfile
       - run: pnpm check
+        env:
+          NODE_OPTIONS: "--max-old-space-size=2048"
 
   build-image:
     if: startsWith(github.ref, 'refs/tags/')