Implement annual Raphcon expiry for admins to maintain game fairness

[Copilot]

Raphcons older than one year now automatically expire when an admin opens the app. Since Firebase Functions aren't available, this client-side approach ensures fairness without infrastructure costs.

Implementation

Data layer (raphcons_remote_datasource.dart)

• Query active Raphcons where createdAt < (now - 365 days)
• Batch update: mark isActive = false and decrement user raphconCount
• Null-safe userId validation

Presentation layer (raphcon_bloc.dart)

• ExpireOldRaphconsEvent triggers on admin login
• Silent execution—no loading states or error notifications

UI integration (public_user_list_page.dart)

if (isAdminUser) {
  // Admin confirmed via AdminConfigService
  context.read<RaphconBloc>().add(ExpireOldRaphconsEvent());
}

Configuration (app_constants.dart)

• raphconExpiryDays = 365 for easy adjustment

Security

Existing Firebase rules already enforce admin-only updates to raphcons. Firestore batch operations ensure atomicity. Soft delete preserves audit trail.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Als Beteiligter möchte ich, dass meine Raphcons ablaufen, um das Game fair zu halten</issue_title>
<issue_description>Raphcons sollten jährlich ablaufen. Da wir ein kostenloses Projekt haben, müssen wir auf firebase functions verzichten.

Daher die Idee, wenn ein Admin die app öffnet, muss gecheckt werden, ob abgelaufene Raphcons existieren.

Beachte security firebase rules.

Achtung: Nur bei Admins</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Als Beteiligter möchte ich, dass meine Raphcons ablaufen, um das Game fair zu halten #2

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