Refactor AI Agent and AI Config handling across multiple files

- Updated function signatures to accept AI Agent and AI Config as non-pointer types for better clarity and safety.
- Modified instances where AI Agent and AI Config were dereferenced to improve code readability.
- Removed unnecessary nil checks for AI Agent and AI Config, simplifying the logic.
- Adjusted related tests and services to align with the new function signatures.
- Cleaned up code in runtime, skills, and executor packages to ensure consistency in handling AI configurations.

internal/ai/skills/runlog_service.go

@@ -20,7 +20,7 @@ type RunLogService struct{}
 func (s *RunLogService) Build(ctx RuntimeContext, plan *ExecutionPlan, trace *ExecutionTrace, err error) *models.SkillRunLog {
 	log := &models.SkillRunLog{
 		ConversationID:  ctx.ConversationID,
-		AIAgentID:       resolveRuntimeAIAgentID(ctx, plan),
+		AIAgentID:       ctx.AIAgent.ID,
 		ManualSkillCode: ctx.ManualSkillCode,
 		IntentCode:      ctx.IntentCode,
 		UserMessage:     ctx.UserMessage,
@@ -28,11 +28,10 @@ func (s *RunLogService) Build(ctx RuntimeContext, plan *ExecutionPlan, trace *Ex
 		CreatedAt:       time.Now(),
 	}
 	if plan != nil {
-		if plan.AIConfig != nil {
-			log.AIConfigID = plan.AIConfig.ID
-			log.UsedModel = plan.AIConfig.ModelName
-			log.UsedProvider = plan.AIConfig.Provider
-		}
+		log.AIConfigID = plan.AIConfig.ID
+		log.UsedModel = plan.AIConfig.ModelName
+		log.UsedProvider = plan.AIConfig.Provider
+
 		if plan.Skill != nil {
 			log.SkillDefinitionID = plan.Skill.ID
 			log.SkillCode = plan.Skill.Code
@@ -53,16 +52,6 @@ func (s *RunLogService) Build(ctx RuntimeContext, plan *ExecutionPlan, trace *Ex
 	return log
 }
 
-func resolveRuntimeAIAgentID(ctx RuntimeContext, plan *ExecutionPlan) int64 {
-	if ctx.AIAgent != nil {
-		return ctx.AIAgent.ID
-	}
-	if plan != nil && plan.AIAgent != nil {
-		return plan.AIAgent.ID
-	}
-	return 0
-}
-
 // Write 写入 Skill 路由日志。
 func (s *RunLogService) Write(log *models.SkillRunLog) error {
 	if log == nil {