feat: Access Manager v3 — RBAC engine, SQLite, permission system
- SQLite database with full schema: users, roles, permissions,
role_permissions, user_roles, services, audit_log
- RBAC engine with wildcard permission resolution (*.*.*)
- Automatic v2→v3 migration from JSON files
- 5 default roles: super_admin, admin, editor, user, viewer
- Feature registration for APP, GGL, FDX (119 permissions)
- 8 services seeded
- Full API: roles CRUD, permission check, user-role assignment,
feature registration, audit log, stats
- Backward compatible with existing auth flows