Generate unique random passwords at first boot for Bitcoin RPC, all database
services (mempool, btcpay, immich, penpot, mysql-root), and Fedimint gateway.
Credentials stored in /var/lib/archipelago/secrets/ with 600 permissions.
Scripts: first-boot-containers.sh, deploy-to-target.sh, deploy-bitcoin-knots.sh,
container-doctor.sh all read from secrets files instead of hardcoded values.
Rust backend: new bitcoin_rpc module reads password from secrets file, env var,
or dev fallback. All .basic_auth() calls and container config strings now use
the shared credential reader instead of hardcoded "archipelago123".
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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