openspec: laravel-admin change — Filament admin (users/tags/products/orders/dashboard) on shared Postgres

openspec/changes/laravel-admin/specs/database/spec.md

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+## ADDED Requirements
+
+### Requirement: users.is_admin column
+The `users` table SHALL include an `is_admin` boolean column, NOT NULL default FALSE, added idempotently.
+
+#### Scenario: Fresh database
+- **WHEN** `db/schema.sql` is applied to an empty database
+- **THEN** `users.is_admin` exists defaulting to FALSE
+
+#### Scenario: Existing database
+- **WHEN** `db/schema.sql` is re-applied to an existing database
+- **THEN** the column is added without error