Add structured rotating logging for the daemon

[Egge21M]

Summary

• add a production-oriented daemon logger that writes structured JSON logs to ~/.cocod/daemon.log
• rotate logs automatically with sane defaults and env-based overrides for path, level, size, and retention
• route daemon lifecycle, request, and wallet-library logging through the same logger with sensitive field redaction

Details

This change makes daemon logging work reliably even when the CLI auto-spawns the daemon in detached mode. Instead of losing logs to ignored stdout/stderr, the daemon now writes to a dedicated log file in the cocod config directory.
It also adds:

• request logging with method, path, status, duration, and request id
• lifecycle logging for startup, shutdown, config load, and unexpected failures
• log rotation with retention to avoid unbounded file growth
• redaction for sensitive values such as passphrases, mnemonics, tokens, invoices, and payment request data
• README updates describing the new logging defaults and configuration knobs