chore: misc fixes — NGX_URL, ai_score default, dbtask indexes, CLAUDE.md

- Fix NGX_URL in huiwings htyproc.env (remove /api/ngx suffix)
- Add #[serde(default)] to AiScorePayload::compare_url
- Add dbtask indexes (status_created, updated_at) for task processing perf
- Add CLAUDE.md with server mappings and deployment rules
- Ignore test-results/

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.gitignore

@@ -11,3 +11,4 @@ node_modules/
 
 dist/
 coverage/
+/test-results/