Add dev-prod harmonize tool for bidirectional catalog and image sync.

Schema migrates dev to prod only; catalog rows merge by updated_at and images by mtime with union merge and conflict reporting.

Co-authored-by: Cursor <cursoragent@cursor.com>

.gitignore

@@ -6,6 +6,8 @@ client/node_modules/
 .env.*.local
 infra/docker/.env.prod
 infra/deploy/devtoprod.config.json
+infra/deploy/harmonize.config.json
+db/SyncReports/
 infra/deploy/last-docker-release.json
 
 # DB backups (may contain data)