feat: add i18n descriptions to all hands and channels (#22)

Add [i18n.zh], [i18n.zh-TW], [i18n.ja], [i18n.ko], [i18n.de], [i18n.es]
sections with translated descriptions to:
- 15 Hand TOML files (hands/*/HAND.toml)
- 44 Channel TOML files (channels/*.toml)

This enables the website to display localized Hand and Channel descriptions
based on the user's selected language.

hands/reddit/HAND.toml

@@ -995,7 +995,7 @@ default_active = false
 
 [i18n.zh]
 name = "Reddit Hand"
-description = "自主 Reddit 管理——监控子版块、发布内容、回复帖子并追踪 Karma 和互动"
+description = "自主 Reddit 管理——监控子版、发布内容、回复帖子、追踪 Karma 与互动"
 category = "通信"
 
 [i18n.zh.settings.subreddits]
@@ -1042,11 +1042,14 @@ description = "参与话题的过滤级别——严格模式会跳过争议性
 label = "真实性模式"
 description = "维持类人互动模式以避免机器人检测的策略"
 
+[i18n.zh-TW]
+description = "自主 Reddit 管理——監控子版、發布內容、回覆貼文、追蹤 Karma 與互動"
+
 # ─── Spanish (Español) ────────────────────────────────────────────────────
 
 [i18n.es]
 name = "Hand de Reddit"
-description = "Gestor autónomo de Reddit — monitorea subreddits, publica contenido, responde en hilos y rastrea karma e interacciones"
+description = "Gestor autónomo de Reddit — monitorea subreddits, publica contenido, responde hilos y rastrea karma y engagement"
 category = "Comunicación"
 
 [i18n.es.settings.subreddits]
@@ -1097,7 +1100,7 @@ description = "Estrategia para mantener patrones de interacción similares a los
 
 [i18n.ja]
 name = "Reddit Hand"
-description = "自律型Redditマネージャー——サブレディットの監視、コンテンツ投稿、スレッドへの返信、Karmaとエンゲージメントの追跡"
+description = "自律型Redditマネージャー——サブレディット監視、投稿、返信、カルマとエンゲージメント追跡"
 category = "コミュニケーション"
 
 [i18n.ja.settings.subreddits]
@@ -1199,7 +1202,7 @@ description = "Stratégie pour maintenir des modèles d'interaction humains et
 
 [i18n.de]
 name = "Reddit-Hand"
-description = "Autonomer Reddit-Manager — überwacht Subreddits, postet Inhalte, antwortet in Threads und verfolgt Karma und Engagement"
+description = "Autonomer Reddit-Manager — überwacht Subreddits, postet Inhalte, antwortet auf Threads, verfolgt Karma und Engagement"
 category = "Kommunikation"
 
 [i18n.de.settings.subreddits]
@@ -1250,7 +1253,7 @@ description = "Strategie zur Aufrechterhaltung menschlicher Interaktionsmuster z
 
 [i18n.ko]
 name = "Reddit Hand"
-description = "자율 Reddit 관리 — 서브레딧 모니터링, 콘텐츠 게시, 스레드 댓글 및 카르마와 참여도 추적"
+description = "자율 Reddit 관리자 — 서브레딧 모니터링, 콘텐츠 게시, 스레드 답글, 카르마 및 참여 추적"
 category = "커뮤니케이션"
 
 [i18n.ko.settings.subreddits]