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/ai/workflow/registry/registry.go

@@ -248,14 +248,15 @@ func DefaultRegistry() *Registry {
 			},
 		},
 		NodeSpec{
-			Type:        NodeTypeHandoffToHuman,
-			Title:       "Handoff To Human",
-			Description: "Transfer the conversation to human support.",
-			Icon:        "HeadphonesIcon",
-			RiskLevel:   NodeRiskLevelHigh,
+			Type:                            NodeTypeHandoffToHuman,
+			Title:                           "Handoff To Human",
+			Description:                     "Transfer the conversation to human support.",
+			Icon:                            "HeadphonesIcon",
+			RiskLevel:                       NodeRiskLevelHigh,
+			RequiresConfirmationPredecessor: true,
 			InputSchema: []VariableSpec{
 				requiredInput("reason", "转人工原因", VariableTypeString, "触发转人工处理的业务原因。"),
-				optionalInput("confirmed", "已确认", VariableTypeBoolean, "客户是否已确认转人工。"),
+				requiredInput("confirmed", "已确认", VariableTypeBoolean, "客户是否已确认转人工。"),
 			},
 			OutputSchema: []VariableSpec{
 				output("handoffId", "转人工记录 ID", VariableTypeInteger, "本次转人工操作的内部记录编号。"),