fix(kagi-aggregator): pass env vars to cron jobs
Cron runs in a separate environment that doesn't inherit the container's
environment variables. This caused the COVES_API_KEY to be unavailable
when the cron job executed, resulting in failed runs.
Fix:
- Export COVES_* and PATH to /etc/environment at container startup
- Source /etc/environment in crontab before running the aggregator
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>