Stage 6.3: RatDigg ASIC miners, miner dealers on the black market, miner era event

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/Decentralized/Night.cs

@@ -220,6 +220,11 @@ namespace Decentralized
                 ps.AddNightLog(L.T("nightlog.drained", WalletWindow.NameOf(w), Fmt.Credits(v)), "cc7755");
             }
             ChainNight(d, day);
+            switch (d.Network.EraNight(day, d.Rng))
+            {
+                case Network.EraStep.Warn: News.Show("pd_news_erawarn_" + day, L.T("news.erawarn.title"), L.T("news.erawarn.desc"), 5); break;
+                case Network.EraStep.Start: News.Show("pd_news_era_" + day, L.T("news.era.title"), L.T("news.era.desc"), 5); Log.Info("矿机时代到来：NPC 耗电效率翻倍"); break;
+            }
             foreach (var e in perpEvents)
             {
                 string who = e.Product + " " + L.T(e.Long ? "perp.long" : "perp.short");