prosolis 6387380d0a Add appservice auth mode behind AUTH_MODE; land device grant ...

Two things, entangled in the working tree because 20d1f92 was mislabeled
(its message claimed "device grant" but it only deleted registration.yaml.example
and left the failed appservice+/sync hybrid in client.go):

1. Land the MAS OAuth 2.0 device grant that was running in prod but never
   committed: masauth.go + client.go rewrite. Bot stays a normal user so /sync
   works; refresh token persisted in data/mas_auth.json.

2. Add "appservice" as an alternate transport behind AUTH_MODE (default
   "masdevice" = unchanged device-grant path, instant rollback):
   - internal/bot/session.go: Session abstraction unifying both transports
     (OnEventType/Run/Stop); NewSession dispatches on AuthMode.
   - internal/bot/appservice.go: as_token auth (MAS-durable, no login/MFA/expiry),
     cryptohelper MSC4190 device creation, crypto machine fed from Synapse
     transaction pushes (to-device/device-lists/OTK) instead of /sync, inbound
     decrypt+redispatch, and lazy per-room StateStore backfill (encryption +
     members) so replies in encrypted rooms encrypt to the right recipients.
   - main.go: NewSession/sess.OnEventType/sess.Run in place of the /sync loop.
   - .env.example: AUTH_MODE, AS_REGISTRATION, AS_LISTEN_HOST/PORT, HOMESERVER_DOMAIN.

The appservice path fixes the earlier hybrid's fatal flaw (Synapse forbids AS
users from /sync) by using the transaction/push model. Bot-side only; Synapse
registration + experimental_features (msc2409/msc3202/msc4190) and E2EE cutover
are the next steps. Build + vet green (CGO=1 -tags goolm).

2026-07-03 17:11:58 -07:00

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