Adds glitchtip-web + glitchtip-worker to docker-compose.prod.yml using
the shared postgres/redis services. Caddy proxies errors.gendsgn.ru to
glitchtip-web:8080 with auto-TLS. Bootstrap script handles DB creation
and first-run setup idempotently.
Env contract: GLITCHTIP_DB_PASS, GLITCHTIP_SECRET in .env;
GLITCHTIP_DSN and NEXT_PUBLIC_GLITCHTIP_DSN populated after UI setup.
