- Reworked the tenant admin login page

- Updated the User model to implement Filament’s tenancy contracts
- Seeded a ready-to-use demo tenant (user, tenant, active package, purchase)
- Introduced a branded, translated 403 error page to replace the generic forbidden message for unauthorised admin hits
- Removed the public “Register” links from the marketing header
- hardened join event logic and improved error handling in the guest pwa.

resources/lang/vendor/filament-panels/de/pages/auth/login.php

@@ -0,0 +1,12 @@
+<?php
+
+return [
+    'title' => 'Tenant-Login',
+    'form' => [
+        'actions' => [
+            'authenticate' => [
+                'label' => 'Anmelden',
+            ],
+        ],
+    ],
+];

resources/lang/vendor/filament-panels/en/pages/auth/login.php

@@ -0,0 +1,12 @@
+<?php
+
+return [
+    'title' => 'Tenant Login',
+    'form' => [
+        'actions' => [
+            'authenticate' => [
+                'label' => 'Sign in',
+            ],
+        ],
+    ],
+];