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/application/runtime/engine.go

@@ -0,0 +1,58 @@
+package runtime
+
+import (
+	"context"
+	"errors"
+	"strings"
+
+	"agent-desk/internal/pkg/errorsx"
+)
+
+const (
+	EngineCodeWorkflow   = "workflow"
+	EngineCodeAutonomous = "autonomous"
+)
+
+// Engine executes one Agent Runtime mode. Implementations must keep business
+// mutations behind AgentDesk services and return a normalized RunResult.
+type Engine interface {
+	Code() string
+	Run(ctx context.Context, req RunInput) (*RunResult, error)
+	Resume(ctx context.Context, req ResumeInput) (*RunResult, error)
+}
+
+// EngineRegistry resolves the runtime implementation. Workflow is the default
+// until Agent runtime modes are persisted on AIAgent in the next migration.
+type EngineRegistry struct {
+	engines map[string]Engine
+}
+
+func NewEngineRegistry(engines ...Engine) *EngineRegistry {
+	registry := &EngineRegistry{engines: make(map[string]Engine, len(engines))}
+	for _, engine := range engines {
+		if engine == nil || strings.TrimSpace(engine.Code()) == "" {
+			continue
+		}
+		registry.engines[strings.TrimSpace(engine.Code())] = engine
+	}
+	return registry
+}
+
+func NewDefaultEngineRegistry() *EngineRegistry {
+	return NewEngineRegistry(NewWorkflowEngine(), NewAutonomousEngine(), NewHybridEngine())
+}
+
+func (r *EngineRegistry) Resolve(code string) (Engine, error) {
+	if r == nil {
+		return nil, errors.New("agent runtime engine registry is not configured")
+	}
+	code = strings.TrimSpace(code)
+	if code == "" {
+		code = EngineCodeWorkflow
+	}
+	engine := r.engines[code]
+	if engine == nil {
+		return nil, errorsx.InvalidParam("agent runtime engine does not exist")
+	}
+	return engine, nil
+}