feat: Add LESMEE database migration with hybrid key strategy

[VuQuoc18]

Summary

• Add 11 new Alembic migrations for LESMEE database schema
• Create enums.py file with 12 ENUM types
• Restructure models.py with domain-based organization
• Add complete LESMEE models file (lesmee_models_complete.py)
• Implement hybrid key strategy (INT for internal, UUID for public entities)
• Add 16 new tables: users, staff, customers, products, orders, workflow tables, etc.
• Include proper indexing and relationships

Migration Details

• UUID extension setup for LESMEE schema
• ENUM types: user roles, order status, payment status, etc.
• Complete LESMEE business model structure
• Performance indexes for optimized queries
• Domain-based model organization for better maintainability

Test Plan

• Run all migration files in sequence
• Verify table creation and relationships
• Test ENUM type constraints
• Validate hybrid key strategy implementation
• Check indexing for performance
• Run existing test suite to ensure compatibility