The hardcoded fallback default for GoldRush.ZonePool still used the
old ZoneName|AreaLabel format after the parser switched to
ZoneName|NodeEntries|BonusEntries. Not a crash risk (BuildNodeEntries
safely no-ops on non-numeric input) but stale and misleading. Cleared
to an empty default -- the real default lives in gold_rush.conf.dist.
Also added CHANGELOG entries for both this PR's zone-specific
resources feature and the earlier null-session broadcast crash fix
(PR #3), neither of which had been logged despite being merged.
- GoldRushSite gains NodeEntries and BonusEntries vectors.
- GoldRush.ZonePool now uses the 2-segment v2 format:
ZoneName|NodeEntries|BonusEntries.
- AreaLabel segment removed; all zone names resolve directly via AreaTable.dbc.
- Per-node bonus chance controlled by GoldRush.BonusChancePercent (default 15).
- Backward compatibility: zones without entries fall back to global NodeEntries.
- conf/gold_rush.conf.dist updated with full 57-zone pool and BonusChancePercent.
- CHANGELOG.md updated.
Implements docs/zone-specific-resources-spec.md section 3.
Relates to PR #4
