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/linkedin/HAND.toml

@@ -2,6 +2,11 @@ id = "linkedin"
 version = "1.0.0"
 name = "LinkedIn Hand"
 description = "Autonomous LinkedIn manager — profile optimization, content creation, networking, and professional engagement"
+
+[i18n.zh]
+name = "LinkedIn Hand"
+description = "自主 LinkedIn 管理——个人资料优化、内容创作、人脉拓展和职业互动"
+
 category = "communication"
 icon = "\U0001F4BC"
 tools = [