feat(i18n): add Chinese translations for all 14 hands

Add [i18n.zh] sections with localized name and description to every
HAND.toml in the registry.

hands/trader/HAND.toml

@@ -2,6 +2,11 @@ id = "trader"
 version = "1.0.0"
 name = "Trading Hand"
 description = "Autonomous market intelligence and trading engine — multi-signal analysis, adversarial bull/bear reasoning, calibrated confidence scoring, strict risk management, and portfolio-level analytics"
+
+[i18n.zh]
+name = "交易 Hand"
+description = "自主市场情报与交易引擎——多信号分析、对抗性多空推理、校准置信度评分、严格风控和投资组合分析"
+
 category = "data"
 icon = "📈"