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>

envs/huiwings/htyproc.env

@@ -7,7 +7,7 @@ HTYUC_URL=http://127.0.0.1:3000
 HTYWS_URL=http://127.0.0.1:3001
 AI_URL=https://ai.alchemy-studio.cn
 TS_DOMAIN=ts.huiwings.cn
-NGX_URL=https://admin.huiwings.cn/api/ngx
+NGX_URL=https://admin.huiwings.cn
 
 REDIS_HOST=localhost
 REDIS_PORT=6379