- 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.

docs/screenshots/tenant-admin-onboarding/03-package-selection.svg

@@ -0,0 +1,57 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1280 720">
+  <rect width="1280" height="720" fill="#f1f5f9"/>
+  <text x="80" y="120" font-size="56" font-family="Inter, Arial, sans-serif" font-weight="700" fill="#0f172a">
+    Wähle dein Eventpaket
+  </text>
+  <g transform="translate(80,180)">
+    <rect width="320" height="360" rx="24" fill="#ffffff" stroke="#e2e8f0" stroke-width="2"/>
+    <text x="40" y="80" font-size="32" font-family="Inter, Arial, sans-serif" font-weight="700" fill="#0f172a">
+      Starter
+    </text>
+    <text x="40" y="130" font-size="22" font-family="Inter, Arial, sans-serif" fill="#1f2937">
+      1 Event, 250 Uploads
+    </text>
+    <text x="40" y="200" font-size="48" font-family="Inter, Arial, sans-serif" font-weight="700" fill="#f43f5e">
+      29 €
+    </text>
+    <rect x="40" y="260" width="200" height="56" rx="28" fill="#f43f5e"/>
+    <text x="70" y="298" font-size="24" font-family="Inter, Arial, sans-serif" fill="#ffffff">
+      Paket wählen
+    </text>
+  </g>
+  <g transform="translate(460,180)">
+    <rect width="320" height="360" rx="24" fill="#0f172a"/>
+    <text x="40" y="80" font-size="32" font-family="Inter, Arial, sans-serif" font-weight="700" fill="#f8fafc">
+      Pro
+    </text>
+    <text x="40" y="130" font-size="22" font-family="Inter, Arial, sans-serif" fill="#e2e8f0">
+      3 Events, 1000 Uploads, Premium-Support
+    </text>
+    <text x="40" y="200" font-size="48" font-family="Inter, Arial, sans-serif" font-weight="700" fill="#38bdf8">
+      79 €
+    </text>
+    <rect x="40" y="260" width="200" height="56" rx="28" fill="#38bdf8"/>
+    <text x="70" y="298" font-size="24" font-family="Inter, Arial, sans-serif" fill="#0f172a">
+      Paket wählen
+    </text>
+  </g>
+  <g transform="translate(840,180)">
+    <rect width="320" height="360" rx="24" fill="#ffffff" stroke="#e2e8f0" stroke-width="2"/>
+    <text x="40" y="80" font-size="32" font-family="Inter, Arial, sans-serif" font-weight="700" fill="#0f172a">
+      Enterprise
+    </text>
+    <text x="40" y="130" font-size="22" font-family="Inter, Arial, sans-serif" fill="#1f2937">
+      Unbegrenzte Events, SLA, Custom Branding
+    </text>
+    <text x="40" y="200" font-size="48" font-family="Inter, Arial, sans-serif" font-weight="700" fill="#0ea5e9">
+      Auf Anfrage
+    </text>
+    <rect x="40" y="260" width="200" height="56" rx="28" fill="#0ea5e9"/>
+    <text x="60" y="298" font-size="24" font-family="Inter, Arial, sans-serif" fill="#ffffff">
+      Beratung anfragen
+    </text>
+  </g>
+  <text x="80" y="600" font-size="20" font-family="Inter, Arial, sans-serif" fill="#475569">
+    Stripe & PayPal Widgets erscheinen unterhalb der Karten, sobald Keys konfiguriert sind.
+  </text>
+</svg>