[ERP-CONSTRUCCION] feat: Implement 6 core business modules
Branches:
- 5 services: branch, schedule, inventory-settings, payment-terminal, user-assignment
- Hierarchical management, schedules, terminals
Products:
- 6 services: category, product, price, supplier, attribute, variant
- Hierarchical categories, multi-pricing, variants
Projects:
- 6 services: project, task, timesheet, milestone, member, stage
- Kanban support, timesheet approval workflow
Sales:
- 2 services: quotation, sales-order
- Full sales workflow with quotation-to-order conversion
Invoices:
- 2 services: invoice, payment
- Complete invoicing with payment allocation
Notifications:
- 5 services: notification, preference, template, channel, in-app
- Multi-channel support (email, sms, push, whatsapp, in-app)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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