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.

cmd/testdata/aiagent/init.go

@@ -142,14 +142,12 @@ func getDefaultTeamIDs() string {
 }
 
 func getDefaultSkillIDs() (string, error) {
-	skillItem := repositories.SkillDefinitionRepository.Take(
+	skillItem := repositories.SkillDefinitionRepository.FindOne(
 		sqls.DB(),
-		"code = ? AND status = ?",
-		skill.AfterSalesEscalationSkillCode,
-		enums.StatusOk,
+		sqls.NewCnd().Where("status = ?", enums.StatusOk).Desc("id"),
 	)
 	if skillItem == nil {
-		return "", fmt.Errorf("default test skill not found: %s", skill.AfterSalesEscalationSkillCode)
+		return "", fmt.Errorf("default test skill not found")
 	}
 	return utils.JoinInt64s([]int64{skillItem.ID}), nil
 }

cmd/testdata/seeds/skill.go

@@ -5,10 +5,7 @@ import (
 	"agent-desk/internal/pkg/enums"
 )
 
-const AfterSalesEscalationSkillCode = "after_sales_escalation_skill"
-
 type SkillDefinitionSeed struct {
-	Code          string
 	Name          string
 	Description   string
 	Instruction   string
@@ -22,7 +19,6 @@ func SkillDefinitionSeeds(lang seedlang.Language) []SkillDefinitionSeed {
 	if lang == seedlang.English {
 		return []SkillDefinitionSeed{
 			{
-				Code:        AfterSalesEscalationSkillCode,
 				Name:        "After-sales Escalation",
 				Description: "Handles incidents, complaints, after-sales follow-up, ticket creation, and human handoff requests. Match only when the user clearly needs after-sales intervention or escalation; do not match ordinary greetings, product introductions, or general inquiries.",
 				Instruction: `You are the dedicated "After-sales Escalation" skill responsible for customer support requests that require escalation.
@@ -65,7 +61,6 @@ Response requirements:
 	}
 	return []SkillDefinitionSeed{
 		{
-			Code:        AfterSalesEscalationSkillCode,
 			Name:        "售后升级处理",
 			Description: "处理报障、投诉、售后跟进、建单、转人工等升级诉求。只在用户明确需要售后介入或问题升级处理时命中，不处理普通问候、产品介绍或泛咨询。",
 			Instruction: `你是“售后升级处理”专项 Skill，负责承接需要升级处理的客服诉求。

cmd/testdata/skill/init.go

@@ -6,13 +6,12 @@ import (
 	"agent-desk/internal/models"
 	"agent-desk/internal/repositories"
 	"fmt"
+	"strings"
 	"time"
 
 	"github.com/mlogclub/simple/sqls"
 )
 
-const AfterSalesEscalationSkillCode = seeds.AfterSalesEscalationSkillCode
-
 type InitResult struct {
 	Created int
 	Updated int
@@ -24,7 +23,7 @@ func Init(lang seedlang.Language) (*InitResult, error) {
 	for _, item := range seedItems {
 		itemCopy := item
 		if err := sqls.WithTransaction(func(ctx *sqls.TxContext) error {
-			existing := repositories.SkillDefinitionRepository.Take(ctx.Tx, "code = ?", itemCopy.Code)
+			existing := repositories.SkillDefinitionRepository.Take(ctx.Tx, "name = ?", strings.TrimSpace(itemCopy.Name))
 			if existing != nil {
 				if err := ctx.Tx.Model(existing).Updates(&itemCopy).Error; err != nil {
 					return err
@@ -50,7 +49,6 @@ func buildModels(lang seedlang.Language) []models.SkillDefinition {
 	items := make([]models.SkillDefinition, 0, len(seedItems))
 	for _, seed := range seedItems {
 		items = append(items, models.SkillDefinition{
-			Code:          seed.Code,
 			Name:          seed.Name,
 			Description:   seed.Description,
 			Instruction:   seed.Instruction,