feat: Charaktere-Modul mit Pathbuilder Import

Backend:
- Characters-Modul (CRUD, HP-Tracking, Conditions)
- Pathbuilder 2e JSON Import Service
- Claude API Integration für automatische Übersetzungen
- Translations-Modul mit Datenbank-Caching
- Prisma Schema erweitert (Character, Abilities, Skills, Feats, Items, Resources)

Frontend:
- Kampagnen-Detailseite mit Mitglieder- und Charakterverwaltung
- Charakter erstellen Modal
- Pathbuilder Import Modal (Datei-Upload + JSON-Paste)
- Logo-Integration (Dimension 47 + Zeasy)
- Cinzel Font für Branding

Weitere Änderungen:
- Auth 401 Redirect Fix für Login-Seite
- PROGRESS.md mit Projektfortschritt

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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