v0.15.4 — Fix: Fusion ilog API days cap

Summary: The /ilog endpoint caps at 7 days server-side — days=180 always returned a 400 error with an HTML page, making the weekly reconciliation cron silently fail.

Changes

• Fix: Fusion ilog days cap — Changed BACKFILL_DAYS from 180 to 7 and get_ilog() default from 180 to 7. Fusion's /ilog endpoint rejects values >= 10 with an HTML error page (SPA shell). The weekly cron now fetches the last 7 days of probe data on each run — InfluxDB dedup handles overlapping writes.

Full Changelog: v0.15.3...v0.15.4