Add JWT_INVITE_SECRET to API container environment

docker-compose.yml explicitly enumerates each env var passed to
containers, so the new JWT_INVITE_SECRET needed to be wired through
the environment block or the API would fail Zod env validation at
startup.

Bunker Admin

docker-compose.yml

@@ -30,6 +30,7 @@ services:
       - REDIS_URL=redis://:${REDIS_PASSWORD}@redis-changemaker:6379
       - JWT_ACCESS_SECRET=${JWT_ACCESS_SECRET}
       - JWT_REFRESH_SECRET=${JWT_REFRESH_SECRET}
+      - JWT_INVITE_SECRET=${JWT_INVITE_SECRET}
       - JWT_ACCESS_EXPIRY=${JWT_ACCESS_EXPIRY:-15m}
       - JWT_REFRESH_EXPIRY=${JWT_REFRESH_EXPIRY:-7d}
       - ENCRYPTION_KEY=${ENCRYPTION_KEY}