Add detailed [CDC] prefixed logs to all CDC handlers:
- cdc-consumer.service.ts: log message parsing, handler dispatch
- user-synced.handler.ts: log user sync operations with field details
- adoption-synced.handler.ts: log adoption sync and contribution calc
- referral-synced.handler.ts: log referral relationship sync
All logs use consistent [CDC] prefix for easy filtering.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>