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/lead/HAND.toml

@@ -834,7 +834,7 @@ activation_warning = "Lead hand runs continuously and generates leads on schedul
 
 [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"
+description = "自主获客——按计划发现、充实并交付合格线索"
 category = "数据"
 
 [i18n.zh.settings.target_industry]
@@ -885,11 +885,14 @@ description = "线索评分时使用的销售资质评估方法论"
 label = "CRM 导出格式"
 description = "在标准报告之外生成 CRM 可导入的文件"
 
+[i18n.zh-TW]
+description = "自主獲客——按排程發現、充實並交付合格線索"
+
 # ─── Korean (한국어) ────────────────────────────────────────────────────
 
 [i18n.ko]
 name = "리드 생성 Hand"
-description = "자율 리드 생성 — 일정에 따라 적격 리드를 탐색, 보강 및 전달"
+description = "자율 리드 생성 — 일정에 따라 잠재 고객을 발견, 보강, 전달"
 category = "데이터"
 
 [i18n.ko.settings.target_industry]
@@ -944,7 +947,7 @@ description = "표준 보고서와 함께 CRM 가져오기용 파일 생성"
 
 [i18n.ja]
 name = "リード生成 Hand"
-description = "自律型リード生成エージェント——スケジュールに基づき見込み客を発見・情報付加・配信"
+description = "自律型リード生成——スケジュールに従い見込み客を発見・充実・配信"
 category = "データ"
 
 [i18n.ja.settings.target_industry]
@@ -999,7 +1002,7 @@ description = "標準レポートに加えてCRMインポート用ファイル
 
 [i18n.es]
 name = "Hand de Generación de Leads"
-description = "Generación autónoma de leads — descubre, enriquece y entrega leads cualificados según un calendario"
+description = "Generación autónoma de leads — descubre, enriquece y entrega leads cualificados según horario"
 category = "Datos"
 
 [i18n.es.settings.target_industry]
@@ -1109,7 +1112,7 @@ description = "Générer un fichier importable CRM en plus du rapport standard"
 
 [i18n.de]
 name = "Lead-Generierungs-Hand"
-description = "Autonome Lead-Generierung — entdeckt, bereichert und liefert qualifizierte Leads nach Zeitplan"
+description = "Autonome Leadgenerierung — entdeckt, bereichert und liefert qualifizierte Leads nach Zeitplan"
 category = "Daten"
 
 [i18n.de.settings.target_industry]