wip(183): scaffold fanout service#316
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PR description:
Implements apps/backend/src/services/fanout.ts: given an unsent message plus a sender-provided { recipientDeviceId → ciphertext } map, validates the device set exactly matches current active recipient devices before persisting.
Resolves conversation members → their active (non-revoked) userDevices, excluding sender's own sending device
If client's provided device set doesn't match, returns device_set_mismatch with the authoritative device list (no silent drop, no guessed ciphertext)
Message insert + bulk envelope insert run in a single db.transaction
Sender's other devices included in the authoritative set (multi-device self-sync)
Closes #183