- Add oem_code_copies table and analytics module for tracking part code copies
- Integrate PostHog for frontend product analytics (VIN decode, OEM copy events)
- Switch email service from stub to Postal API with proper error handling
- Add copy button to parts panel with clipboard + server-side logging
- Add admin copy-logs page with filtering and top-copied-codes view
- Add VIN report endpoint for users to flag unrecognized chassis numbers
- Add Postal email env vars to config schema
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>