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

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

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+## ADDED Requirements
+
+### Requirement: Admin login
+The system SHALL provide a login for admin users at `/admin/login`. Only users with `is_admin = true` SHALL be able to access the admin panel.
+
+#### Scenario: Admin logs in
+- **WHEN** an admin user logs in with valid credentials
+- **THEN** they reach the admin dashboard
+
+#### Scenario: Non-admin blocked
+- **WHEN** an owner (not admin) tries to access the admin panel
+- **THEN** access is denied (403 / redirect)
+
+### Requirement: is_admin flag
+The `users` table SHALL have an `is_admin` boolean, default false.
+
+#### Scenario: Promote a user
+- **WHEN** an existing user is marked admin
+- **THEN** they can log into the admin panel