* fix(health): increase gdeltIntel maxStaleMin from 120 to 180
Seeder runs every ~120min but threshold was exactly 120min, causing
STALE/CRIT flapping whenever there's any timing jitter. 180min gives
a 60min buffer to prevent oscillation.
* fix(health): increase gdeltIntel CACHE_TTL to 4h to match maxStaleMin:180
CACHE_TTL was 7200s (120min) while health.js maxStaleMin was raised to
180min. When a seed run is delayed past 120min the data key expires,
health evaluates EMPTY/CRIT before the stale check can ever fire, making
the 60min warning buffer unreachable. Setting TTL to 14400s (240min)
ensures the key outlives the stale threshold so STALE_SEED triggers
before EMPTY/CRIT on delayed runs.
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