chore(logging): enable rotated logging for supervisord to improve debugging

[lau90eth]

What this PR does / Why we need it:

Currently, supervisord activity logs are discarded to /dev/null, making it impossible to debug supervisord itself (e.g., process restarts, config issues, errors).

This PR enables proper rotated logging for the supervisord activity log:

• logfile=/var/log/supervisord/supervisord.log
• Rotation at 50MB with 10 backups
• loglevel=info for useful but not excessive output

Program stdout/stderr remain redirected to container stdout (visible via docker compose logs), no changes there.

Changes:

• Updated [supervisord] section to enable logfile and rotation.
• No breaking changes to program sections.

Verification (tested locally on WSL2 + Docker Desktop):

• docker compose up -d --build → Services start successfully.
• docker compose logs → No loss of program output; supervisord events now loggable (if issues occur).
• Config remains minimal and production-safe.

References:

• Supervisord logging docs: http://supervisord.org/logging.html (recommends logfile_maxbytes and backups for rotation)

Open to adjustments (e.g., different path, size, or per-program logs). Thanks for reviewing!

[cb-heimdall]

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