schalli
9ec6313f4d
feat(05-03): calendar backend — model, crypto, source CRUD module
- Add CalendarSource Prisma model with encrypted credentials (AES-256-GCM)
- Create CalendarCryptoService with encrypt/decrypt using CALENDAR_ENCRYPTION_KEY
- Create CalendarController with source CRUD endpoints (GET/POST/PATCH/DELETE)
- Create CalendarService with ownership checks and SSRF URL validation
- Add DTOs with https-only URL validation and class-validator decorators
- Register CalendarModule in AppModule
- Install tsdav, node-ical, ews-javascript-api, @microsoft/microsoft-graph-client
- Stub provider files for Task 2 compilation