Add version system, tax tracking, lottery winner DMs, fmtEuro, audit fixes

- Version system: per-plugin versions via Versioned interface, crash_log and
  version_history DB tables, !version command, crash stats in !botinfo
- Tax tracking: tax_ledger table, trackTaxPaid across all communityTax and
  communityPotAdd sites, tax paid display in !stats and !superstatsexplusalpha
- Lottery: DM winners with winning ticket details and matched numbers bolded
- fmtEuro: generic currency formatter with thousand separators across all
  economy display paths
- Audit fixes: streak_decayed column for Streak Survivor achievement,
  combat_narrative empty-phase guard, crafting success rate integer division,
  RecordCrash nil-DB guard

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

internal/plugin/adventure_twinbee.go

@@ -289,7 +289,8 @@ func (p *AdventurePlugin) distributeTwinBeeRewards(result *TwinBeeResult) TwinBe
 		if share < 1 {
 			share = 1
 		}
-		p.euro.Credit(ep.uid, float64(share), "twinbee_daily_share")
+		net, _ := communityTax(ep.uid, float64(share), 0.05)
+		p.euro.Credit(ep.uid, net, "twinbee_daily_share")
 		totalDistributed += share
 		if rollTwinBeeGift(ep.uid) {
 			summary.GiftCount++