feat(sim-control): wire frequency-sim-control command channel end-to-end

Implements the open items from docs/plans/2026-07-14-frequency-sim-control-design.md
§4/§"Offen für die Implementierungsphase": a per-bridge-token in-memory command
queue piggybacked on the existing telemetry channel, plus the client-side gate
and TTS confirmations.

- server/utils/simControlQueue.ts: TTL-based queue keyed by bridge token
  (enqueue → drainPending → resolve → drainResultsForClient).
- server/api/bridge/data.post.ts: response gains a `commands` field the
  bridge drains on its next telemetry POST.
- server/api/bridge/command.post.ts (new): client enqueues a parsed command,
  re-validated server-side via isValidSimControlCommand.
- server/api/bridge/command-result.post.ts (new): bridge reports ok/failed.
- server/api/bridge/live.get.ts: response gains `commandResults` so the
  client can announce outcomes.
- shared/utils/simControl.ts: wire types, isValidSimControlCommand, and
  simControlRejectionSpeech/simControlResultSpeech TTS phrasing.
- useLiveAtcSession.ts: parseSimControl() gated on bridgeConnected, wired in
  right after the local special cases and before the frequency check —
  matched commands never reach radioBackend.transmit().
- useSimBridgeSync.ts / live-atc.vue: bridgeToken threaded through, command
  results forwarded from the telemetry poll to TTS.

43 new tests (shared parser/validation/speech + server queue lifecycle/TTL).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

server/api/bridge/live.get.ts

@@ -2,6 +2,7 @@ import { createError } from 'h3'
 import { BridgeToken } from '../../models/BridgeToken'
 import { getBridgeTokenFromHeader } from '../../utils/bridge'
 import { flightlabTelemetryStore } from '../../utils/flightlabTelemetry'
+import { simControlQueue } from '../../utils/simControlQueue'
 
 export default defineEventHandler(async (event) => {
   const token = getBridgeTokenFromHeader(event)
@@ -17,6 +18,7 @@ export default defineEventHandler(async (event) => {
       connected: false,
       lastTelemetryAt: null,
       telemetry: null,
+      commandResults: [],
     }
   }
 
@@ -29,5 +31,8 @@ export default defineEventHandler(async (event) => {
     connected: true,
     lastTelemetryAt: timestamp,
     telemetry,
+    // frequency-sim-control (design §4): terminal command results the client
+    // hasn't seen yet, so it can speak a confirmation/failure over TTS.
+    commandResults: simControlQueue.drainResultsForClient(token),
   }
 })