CRUD Dispositivos + requieiremens(Added SQLAlchemy, asyncpg, aiosqlite, pytest, ht…)

[herrdelta83]

**IMPORTANT TO CHECK: ** I don't know if it has pulled with the requirements the CRUD and Tests for "Dispositivos"

New Files Created
entities/dispositivo.py: ORM model — FK to usuario.id, trusted boolean, first_seen / last_seen timestamps

models/dispositivo.py: Pydantic CreateDispositivoRequest, UpdateDispositivoRequest, DispositivoResponse

repositories/dispositivo_repository.py: create, get_by_id, get_all, update, touch, delete

api/dispositivos.py: 6 routes under /api/dispositivos

tests/test_dispositivos.py: 10 tests

Notes
One extra compared to cuenta: POST /api/dispositivos/{id}/touch — stamps last_seen to now, which you'll need every time a device is seen during a session or transaction.

New Files Created
backend/app/database/base.py

backend/app/database/session.py

backend/app/entities/usuario.py

backend/app/models/usuario.py

backend/app/repositories/usuario_repository.py

backend/app/api/usuarios.py

backend/tests/init.py

backend/tests/conftest.py

backend/tests/test_usuarios.py

backend/pytest.ini

Files Modified
backend/requirements.txt: Added SQLAlchemy, asyncpg, aiosqlite, pytest, httpx, email-validator

backend/.env.example: Added DATABASE_URL

backend/app/core/config.py: Added database_url field

backend/app/main.py: Added DB lifespan (create_all on startup)

backend/app/api/router.py: Registered usuarios_router

[salog0d]

no trae crud ni tests