"""mcma-backend — self-hosted, offline-first music service.

Hexagonal (ports & adapters) architecture:

* ``app.domain``         — pure business core: entities, value objects, errors,
                           and *ports* (Protocols). No framework imports.
* ``app.application``    — use cases / services. Orchestrate domain via ports.
* ``app.infrastructure`` — driven adapters: ORM models, repositories, db, redis,
                           source backends, ML/HTTP clients.
* ``app.api``            — driving adapter: FastAPI routers & schemas.
* ``app.core``           — cross-cutting concerns: config, logging, security.
"""

__version__ = "0.1.0"