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/analytics/HAND.toml

@@ -2,6 +2,11 @@ id = "analytics"
 version = "1.0.0"
 name = "Analytics Hand"
 description = "Autonomous data analytics agent — data collection, analysis, visualization, dashboards, and automated reporting"
+
+[i18n.zh]
+name = "数据分析 Hand"
+description = "自主数据分析智能体——数据采集、分析、可视化、仪表盘和自动化报告"
+
 category = "data"
 icon = "📈"
 tools = [