feat(users): add ability to disable users without deleting them

- Add disabled boolean field to user schema (PostgreSQL, MySQL, SQLite)
- Block disabled users from logging in via any auth provider (credentials, LDAP, OIDC)
- Check disabled status in session callback to prevent session replay
- Add changeDisabled API endpoint (admin-only)
- Include disabled field in getById and getAll user endpoints
- Add disable/enable user toggle in admin UI with status badge in user list

packages/db/migrations/sqlite/0009_add_user_disabled.sql

@@ -0,0 +1 @@
+ALTER TABLE "user" ADD COLUMN "disabled" integer DEFAULT 0 NOT NULL;