Christian Nennemann ad636b874b feat(fapp): add E2E encryption for SlotReserve/SlotConfirm ...

- E2E crypto using X25519 key exchange + ChaCha20-Poly1305
- PatientEphemeralKey: generates keypair for reservation
- TherapistCrypto: decrypts reserves, creates confirms with FS
- PatientCrypto: creates reserves, decrypts confirmations
- Wire format helpers for Reserve/Confirm CBOR serialization

FappRouter updates:
- Added DeliverReserve/DeliverConfirm action variants
- process_slot_reserve(): routes to therapist or floods
- process_slot_confirm(): delivers to patient
- send_reserve/send_confirm(): capability-checked sends
- send_response(): relay-to-patient response routing

FappStore additions:
- announces_iter(): iterate all announce vectors
- find_by_id(): lookup announce by ID

29 FAPP tests passing (24 fapp + 7 fapp_router + 5 new E2E crypto)

2026-04-01 16:34:05 +02:00

22 KiB

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