T-005: Create SQLAlchemy ORM models for CoffeeBean and BrewSchedule

[kavyashri-as]

Phase 3 — Data Layer

Task: Create adapters/models.py with SQLAlchemy 2.0 ORM CoffeeBeanORM (table coffee_beans, UNIQUE on name) and BrewScheduleORM (table brew_schedules).

Effort: 45 seconds

Depends on: T-001

Acceptance Criteria: Base.metadata.create_all() creates both tables with correct columns.