Move subscription create/edit from store detail (broken endpoint) to merchant detail page with proper modal UI. Seed 4 subscription tiers (Essential, Professional, Business, Enterprise) in init_production.py. Also includes cross-module dependency declarations, store domain platform_id migration, platform context middleware, CMS route fixes, and migration backups. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Generic single-database configuration.