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/predictor/HAND.toml

@@ -2,6 +2,11 @@ id = "predictor"
 version = "1.0.0"
 name = "Predictor Hand"
 description = "Autonomous future predictor — collects signals, builds reasoning chains, makes calibrated predictions, and tracks accuracy"
+
+[i18n.zh]
+name = "预测 Hand"
+description = "自主预测智能体——收集信号、构建推理链、做出校准预测并追踪准确度"
+
 category = "data"
 icon = "🔮"