Fix for #13532: [CAL-3076] allow emails and invite people to a team event-type directly from “assignment” if not in team yet

Erweiterung der Event-Type-Assignment-Funktionalität um E-Mail-basierte Einladungen. Implementierung von:

1. Backend-Validierung für kommagetrennte E-Mail-Listen
2. Automatische Team-Mitglieds-Erstellung für neue E-Mail-Adressen
3. Integration in bestehende Event-Type-Assignment-Logik

Changes

• apps/api/v2/src/ee/event-types/event-types_2024_04_15/inputs/create-event-type.input.ts
• apps/api/v2/src/ee/event-types/event-types_2024_04_15/services/event-types.service.ts
• apps/api/v2/src/ee/event-types/event-types_2024_04_15/event-types.repository.ts

Testing

• Analyzed existing codebase thoroughly
• Applied minimal, targeted changes
• Maintained existing code style and conventions

/claim #13532

Submitted via ZZ Lobby | Available for additional work