fix(asin): ASIN extraction systems + rate-limit hardening + CI/CD pipeline

[jenilrupapara001]

Summary

Both data-extraction systems (Amazon Creators API + Octoparse) made production-ready, plus CI/CD fixed.

Creators API

• Never-exhaust / never-skip rate limiter (1 TPS + TPD per credential, 429 failover, pauses at daily cap instead of skipping)
• Scheduled sync actually runs (syncSeller routing fix + env fallback)
• Field ownership — API never nulls Octoparse rating/A+ data; %-based price dispute
• Honest per-seller sync status; catch-up pass; batch history inserts

Octoparse

• 429 backoff on status polling, UUID/group caching, index-friendly queries (migration 007)
• Cluster-safe Redis locks; no swallowed cleanup errors; recovery-sync overlap protection

CI/CD

• Backend lockfile regenerated (compression + cron-parser were missing -> npm ci was failing)
• Backend CI now runs unit tests (110 passing) + full-tree syntax check + critical-module import check
• CD applies DB migrations on deploy + uses PM2 ecosystem cluster config (8GB heap, expose-gc)
• ecosystem.config.js paths made deploy-dir agnostic

Verification

• 110/110 backend unit tests green
• Frontend build passes (Vite)
• 7 migrations (001-007) tracked via SchemaMigrations

Deploy note

After merge, CD auto-deploys to the VPS and applies migrations. Requires secrets: SSH_PRIVATE_KEY, DEPLOY_HOST, DEPLOY_USER.