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/lead/HAND.toml

@@ -2,6 +2,11 @@ id = "lead"
 version = "1.0.0"
 name = "Lead Hand"
 description = "Autonomous lead generation — discovers, enriches, and delivers qualified leads on a schedule"
+
+[i18n.zh]
+name = "线索生成 Hand"
+description = "自主线索生成——按计划发现、充实并交付合格的潜在客户"
+
 category = "data"
 icon = "📊"