feat: implement Trunks with real FreeSWITCH gateway sync

- trunks table (tenant-scoped, RLS): host/proxy/realm, register,
  username/password_enc (AES-256-GCM), dtmf_mode, ping, transport, and a
  status/status_updated_at pair meant to be driven by FreeSWITCH events
- apps/api/src/trunks: CRUD (POST/GET/GET:id/DELETE), same RBAC/tenant
  pattern as Extensions, password never exposed in any GET
- packages/telephony: buildGatewayXml() generates a Sofia gateway XML file
- b2bcall-fs-config now writes sip_profiles/external/<trunk_id>.xml (shared
  Docker volume with FreeSWITCH -- the vanilla external profile already
  includes external/*.xml) and runs 'sofia profile external rescan' over
  ESL; syncs on boot and on demand via Redis pub/sub
  (b2bcall:trunks:sync), since apps/api runs on the host and fs-config has
  no port published to reach directly
- added FreeSwitchTelephonyProvider.waitUntilConnected() to fix a startup
  race: the first sync ran before the ESL connection had settled, logging
  a harmless but noisy error
- verified end-to-end with a fake host: create trunk -> gateway file
  written -> FreeSWITCH shows the real gateway (FAIL_WAIT, expected) ->
  delete -> file removed (cleanup also correctly swept the stale
  'example.com' gateway that had been copied into the volume from the
  vanilla image)
- apps/freeswitch-events/src/trunk-status.ts: written to update Trunk.status
  from sofia::gateway_state events, using the same normalizeEslEvent path
  already proven for CHANNEL_* events

- KNOWN GAP, documented rather than glossed over: monitored fs-events for
  ~90s while the gateway visibly transitioned states in FreeSWITCH
  (FAIL_WAIT/DOWN) and no sofia::gateway_state event was observed arriving.
  CUSTOM/sofia::* events have not actually been proven working end-to-end
  in this session -- only CHANNEL_* events have been. Needs verification
  against a real SIP target before the status auto-update can be trusted
  in production. See docs/TRUNKS.md and TODO.md.

- docs/TRUNKS.md

apps/freeswitch-events/src/main.ts

@@ -2,6 +2,7 @@ import Redis from "ioredis";
 import type { FreeSwitchEventData } from "esl";
 import { FreeSwitchTelephonyProvider, normalizeEslEvent } from "@b2bcall/telephony";
 import { createLogger } from "@b2bcall/shared";
+import { updateTrunkStatusFromGatewayEvent } from "./trunk-status";
 
 const logger = createLogger("b2bcall-fs-events");
 
@@ -92,6 +93,14 @@ async function main() {
       callUuid: normalized.callUuid,
       tenantId: normalized.tenantId,
     });
+
+    if (normalized.type === "GATEWAY_UP" || normalized.type === "GATEWAY_DOWN") {
+      const gateway = normalized.data.gateway as string | undefined;
+      const state = normalized.data.state as string | undefined;
+      updateTrunkStatusFromGatewayEvent(gateway, state).catch((err) => {
+        logger.error("falha ao atualizar status do trunk", { error: String(err), gateway });
+      });
+    }
   }
 
   provider.connect();