feat(pos-micro): Implement MVP backend and database schema
POS Micro - Ultra-minimal point of sale (100 MXN/month):
- Database DDL: 10 tables (tenants, users, categories, products,
payment_methods, sales, sale_items, cash_movements,
daily_summaries, whatsapp_sessions)
- NestJS Backend: Complete API with modules for auth, products,
categories, sales, and payments
- Docker Compose: Development environment with PostgreSQL
- Dev scripts: Easy setup for local development
SaaS Billing Schema:
- 10 tables for subscription management (plans, subscriptions,
invoices, payments, usage_tracking, support_tickets)
- Default plans: POS Micro (100 MXN), ERP Básico (300 MXN),
ERP Pro (500 MXN), Vertical (1000+ MXN)
- Support for Stripe and Conekta payment providers
- CFDI integration ready for Mexico
Target: Mexican informal market (street vendors, small shops, food stands)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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