Rename: coin PSC, exchange Poinbase, entry upgrade Web3 Governance Community

The entry network upgrade is the gateway to the whole mod, not only
mining: it now delivers the trading terminal and an RZX 50; rigs are
bought from Dr. Jackson, who always stocks one while the player has none.
The upgrade id changes (unreleased, no migration).

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

src/Decentralized.Domain/Market.cs

@@ -10,7 +10,7 @@ namespace Decentralized.Domain
     public enum MarketEvent { Blackout, Crackdown, GangWar, RevRaidUpper, LowerUnrest }
 
     /// <summary>
-    /// PSCoin 行情与全部交易对。PSCoin 有一个参考价（主交易对：合规交易所 PSC/CRC）；
+    /// PSC 行情与全部交易对。PSC 有一个参考价（主交易对：合规交易所 PSC/CRC）；
     /// 夜间参考价向价格锚回归并加噪声，其余交易对由 NPC 套利者拉向参考价。
     /// </summary>
     public sealed class Market
@@ -39,7 +39,7 @@ namespace Decentralized.Domain
         public Pool Find(Venue venue, string baseAsset, string quote) =>
             Pools.FirstOrDefault(x => x.Venue == venue && x.Base == baseAsset && x.Quote == quote);
 
-        /// <summary>PSCoin 的参考价（信用点）。</summary>
+        /// <summary>PSC 的参考价（信用点）。</summary>
         public double Price => Main.Price;
 
         public double Anchor(ICollection<MarketEvent> active)