fix: delete analytics logs older than 2 days and give vector a 512 MiB cap
- every instance gets a pg_cron job (set up on create, upgrade and resume) that deletes _analytics.log_events_* rows older than 2 days and runs the first cleanup right away; Logflare never deletes stored logs, and instance 3's 2 GB db image died 100% full of them on 2026-10-06, after which analytics 500'd every delivery and vector was OOM-killed by its undeliverable backlog every few minutes - vector's memory limit back to 512 MiB, the ceiling the production supabase charts carry; the retention job bounds its backlog, so 1024 MiB is not needed anymore - version 1.3.2
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