feat(backend): FastAPI + libSQL + auth register/login/me + tests (TDD)
- FastAPI app with lifespan, CORS, health endpoint - SQLAlchemy 2.0 async with aiosqlite, Base/UUIDMixin/TenantMixin/TimestampMixin - Tenant and User models with multi-tenant isolation - Auth: register (creates tenant+user), login, /me endpoint - JWT HS256 tokens, bcrypt password hashing - Alembic async setup with initial migration - 6 passing tests (register, login, wrong password, me, no token, health) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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