fix: remove Firebase target param, grant firebase.admin to deploy SA

'target: hosting' requires explicit firebase target config. Remove it
so the action deploys to the default site. Also grant firebase.admin
and serviceusage.serviceUsageConsumer to the service account.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: DJBen

.github/workflows/release-host.yml

@@ -191,7 +191,6 @@ jobs:
           firebaseServiceAccount: ${{ secrets.FIREBASE_SERVICE_ACCOUNT }}
           projectId: govibe-783119
           channelId: live
-          target: hosting
 
       # ── GitHub Release ─────────────────────────────────────────────────────
       - name: Create GitHub Release