feat(api): implement inventory service with equipment system
Add InventoryService for managing character inventory, equipment, and
consumable usage. Key features:
- Add/remove items with inventory capacity checks
- Equipment slot validation (weapon, off_hand, helmet, chest, gloves,
boots, accessory_1, accessory_2)
- Level and class requirement validation for equipment
- Consumable usage with instant and duration-based effects
- Combat-specific consumable method returning effects for combat system
- Bulk operations (add_items, get_items_by_type, get_equippable_items)
Design decision: Uses full Item object storage (not IDs) to support
procedurally generated items with unique identifiers.
Files added:
- /api/app/services/inventory_service.py (560 lines)
- /api/tests/test_inventory_service.py (51 tests passing)
Task 2.3 of Phase 4 Combat Implementation complete.
Phillip Tarrant
76f67c4a22