Prod DB Integration: Documentation and Deployment Guide

[Enniwhere]

Description:
Document the synchronization system architecture, configuration, deployment, and troubleshooting procedures.

Acceptance criteria:

• Update README.md with synchronization feature overview
• Document configuration: environment variables, sitemap URLs, batch sizes
• Deployment guide: cron setup, log rotation, monitoring
• Troubleshooting section: common errors, how to check sync status, manual sync execution
• Architecture diagram (optional): sitemap → parser → DB → vector indexes
• Example commands: manual sync, dry-run, checking logs

Technical details:
Optional technical details for context.

Design:
Optional details on design for context.