- seed.rs: creates 21 permissions, admin+viewer roles, admin user with Argon2 password
- AuthConfig added to server config with default password Admin@2026
- Server startup: auto-creates default tenant and seeds auth data if not exists
- Idempotent: checks for existing tenant before seeding
- error.rs: AuthError with proper HTTP status mapping
- service/password.rs: Argon2 hash/verify with tests
- service/token_service.rs: JWT sign/validate, token DB storage with SHA-256 hash
- service/auth_service.rs: login/refresh/logout flows with event publishing
- service/user_service.rs: user CRUD with soft delete and tenant isolation
- Added sha2 dependency to workspace for token hashing
- users with partial unique index on (tenant_id, username) WHERE deleted_at IS NULL
- user_credentials, user_tokens with FK cascade
- roles, permissions with composite unique (tenant_id, code)
- role_permissions, user_roles junction tables
- organizations (self-ref tree), departments (tree + org FK), positions
- All tables include standard fields: id, tenant_id, timestamps, soft delete, version
