[TASK-2026-01-25-ERP-INTEGRACIONES] feat: Add payment terminals + AI role-based access
Payment Terminals (MercadoPago + Clip):
- TenantTerminalConfig, TerminalPayment, TerminalWebhookEvent entities
- MercadoPagoService: payments, refunds, links, webhooks
- ClipService: payments, refunds, links, webhooks
- Controllers for authenticated and webhook endpoints
- Retry with exponential backoff
- Multi-tenant credential management
AI Role-Based Access:
- ERPRole config: ADMIN, SUPERVISOR, OPERATOR, CUSTOMER
- 70+ tools mapped to roles
- System prompts per role (admin, supervisor, operator, customer)
- RoleBasedAIService with tool filtering
- OpenRouter integration
- Rate limiting per role
Based on: michangarrito INT-004, INT-005, MCH-012, MCH-013
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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