refactor: replace skill code with skill ID across the application

- Updated skill handling to use skill IDs instead of skill codes in various components, services, and models.
- Modified tests to reflect changes in skill identification.
- Removed references to skill codes in favor of skill IDs for consistency and clarity.
- Updated localization files to remove skill code references and adjust error messages accordingly.

internal/builders/agent_run_log_builder.go

@@ -22,7 +22,7 @@ func BuildAgentRunLog(item *models.AgentRunLog) response.AgentRunLogResponse {
 		AIConfigID:        item.AIConfigID,
 		UserMessage:       item.UserMessage,
 		PlannedAction:     item.PlannedAction,
-		PlannedSkillCode:  item.PlannedSkillCode,
+		PlannedSkillID:    item.PlannedSkillID,
 		PlannedSkillName:  item.PlannedSkillName,
 		SkillRouteTrace:   item.SkillRouteTrace,
 		ToolSearchTrace:   item.ToolSearchTrace,

internal/builders/skill_builder.go

@@ -19,7 +19,6 @@ func BuildSkillDefinitionResponse(item *models.SkillDefinition) response.SkillDe
 	}
 	return response.SkillDefinitionResponse{
 		ID:             item.ID,
-		Code:           item.Code,
 		Name:           item.Name,
 		Description:    item.Description,
 		Instruction:    item.Instruction,