ci(gitea): route npm through npmmirror.com, registry.npmjs.org unreachable from this host

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.gitea/workflows/qa.yml

@@ -8,6 +8,13 @@ concurrency:
 jobs:
   qa:
     runs-on: ubuntu-latest
+    env:
+      # registry.npmjs.org sits behind Cloudflare IPs that this self-hosted
+      # runner cannot reach (times out on both IPv4 and IPv6). npmmirror.com
+      # mirrors the full npm registry and is reachable, so point npm at it
+      # instead of failing every install. GitHub-hosted runners don't need
+      # this, which is why .github/workflows/qa.yml doesn't set it.
+      NPM_CONFIG_REGISTRY: https://registry.npmmirror.com
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4