All env vars now use GITEA_ prefix with fallback to old names:
- GITEA_TOKEN (was PI_GIT_TOKEN)
- GITEA_USER (was PI_GIT_USER)
- GITEA_WEBHOOK_HOST/PORT/TOKEN/URL (was PI_WEBHOOK_*)
- GITEA_POLL_INTERVAL (was PI_BOT_POLL_INTERVAL)
- GITEA_NOTIF_INTERVAL (was PI_NOTIF_POLL_INTERVAL)
- GITEA_HOOKS_URL/PATH/TOKEN (was OPENCLAW_HOOKS_*)
Old names still work as fallbacks for backward compat.