feat: Enhance AI Agent and Channel Management

- Updated labels in the AI Agents dashboard for clarity, changing "流程状态" to "Playbook 状态" and "未发布流程" to "未发布 Playbook".
- Introduced AI Agent rollout percentage management in channel editing, allowing users to set and rollback rollout percentages.
- Added new API endpoints for rolling back AI Agent rollout and fetching agent run metrics.
- Implemented new UI components for displaying agent run details, including status, duration, and input/output tokens.
- Enhanced type definitions for AdminChannel and AIAgent to include rollout percentages and runtime modes.
- Updated navigation to include a section for agent runs.
- Added new translations for agent run features in both English and Chinese.

internal/repositories/conversation_repository.go

@@ -77,6 +77,30 @@ func (r *conversationRepository) Count(db *gorm.DB, cnd *sqls.Cnd) int64 {
 	return cnd.Count(db, &models.Conversation{})
 }
 
+func (r *conversationRepository) CountByAIAgentID(db *gorm.DB, aiAgentID int64) int64 {
+	query := db.Model(&models.Conversation{})
+	if aiAgentID > 0 {
+		query = query.Where("ai_agent_id = ?", aiAgentID)
+	}
+	var count int64
+	if err := query.Count(&count).Error; err != nil {
+		return 0
+	}
+	return count
+}
+
+func (r *conversationRepository) CountHandoffByAIAgentID(db *gorm.DB, aiAgentID int64) int64 {
+	query := db.Model(&models.Conversation{}).Where("handoff_at IS NOT NULL")
+	if aiAgentID > 0 {
+		query = query.Where("ai_agent_id = ?", aiAgentID)
+	}
+	var count int64
+	if err := query.Count(&count).Error; err != nil {
+		return 0
+	}
+	return count
+}
+
 func (r *conversationRepository) Create(db *gorm.DB, t *models.Conversation) (err error) {
 	err = db.Create(t).Error
 	return