chore: remove vestigial env vars from docker-compose (#121)

Closes #121

WORKERS_PER_CORE, TIMEOUT, and GRACEFUL_TIMEOUT were consumed by the
old tiangolo/uvicorn-gunicorn-fastapi base image and are silently
ignored since switching to python:3.12-slim with an explicit uvicorn CMD.

Also applied the same removal to dev (ssh sba-db) and prod (ssh akamai)
docker-compose files directly. Added WEB_WORKERS=4 to prod to override
the Dockerfile default of 2.

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

docker-compose.yml

@@ -23,9 +23,6 @@ services:
       - LOG_LEVEL=${LOG_LEVEL}
       - API_TOKEN=${API_TOKEN}
       - TZ=${TZ}
-      - WORKERS_PER_CORE=1.5
-      - TIMEOUT=120
-      - GRACEFUL_TIMEOUT=120
       - DATABASE_TYPE=postgresql
       - POSTGRES_HOST=sba_postgres
       - POSTGRES_DB=${SBA_DATABASE}