docs: vollständige Projektdokumentation hinzugefügt
- docs/api.md: komplette API-Referenz (1375 Zeilen, alle Endpunkte) - docs/architecture.md: Tech-Stack, DB-Schema, RLS-Architektur, Auth-Flow - docs/deployment.md: Setup, nginx, systemd, update.sh, Backup/Rollback - docs/development.md: Dev-Setup, Test-Workflow, Code-Konventionen, Fallstricke Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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