refactor(settings): replace raw SQL conditions with GORM struct-based queries

- Replace db.Where("key = ?", ...) with db.Where(&Setting{Key: ...}) for type-safe queries
    - Replace db.Order("category, key") with structured clause.OrderBy in list API
    - Replace tx.Where("key = ?", ...) with tx.Where(&models.Setting{Key: ...}) in update API
    - Replace db.Where("key = ?", ...) with db.Where(&Setting{Key: ...}) in InitSettings, settingCache, SetSetting

api/settings/list.go

@@ -10,6 +10,7 @@ import (
 	"github.com/veypi/vbase/cfg"
 	"github.com/veypi/vbase/models"
 	"github.com/veypi/vigo"
+	"gorm.io/gorm/clause"
 )
 
 // ListRequest 列表请求
@@ -27,7 +28,12 @@ func list(x *vigo.X, req *ListRequest) (*ListResponse, error) {
 	db := cfg.DB()
 
 	var settings []models.Setting
-	query := db.Order("category, `key`")
+	query := db.Clauses(clause.OrderBy{
+		Columns: []clause.OrderByColumn{
+			{Column: clause.Column{Name: "category"}},
+			{Column: clause.Column{Name: "key"}},
+		},
+	})
 
 	if req.Category != nil && *req.Category != "" {
 		query = query.Where("category = ?", req.Category)

api/settings/update.go

@@ -44,7 +44,7 @@ func update(x *vigo.X, req *UpdateRequest) (*UpdateResponse, error) {
 	err := db.Transaction(func(tx *gorm.DB) error {
 		for _, item := range req.Settings {
 			var s models.Setting
-			if err := tx.Where("`key` = ?", item.Key).First(&s).Error; err != nil {
+			if err := tx.Where(&models.Setting{Key: item.Key}).First(&s).Error; err != nil {
 				return err
 			}
 			s.Value = item.Value

models/setting.go

@@ -141,7 +141,7 @@ func InitSettings() error {
 	db := cfg.DB()
 	for _, s := range defaultSettings {
 		var count int64
-		if err := db.Model(&Setting{}).Where("`key` = ?", s.Key).Count(&count).Error; err != nil {
+		if err := db.Model(&Setting{}).Where(&Setting{Key: s.Key}).Count(&count).Error; err != nil {
 			return err
 		}
 		if count == 0 {
@@ -155,7 +155,7 @@ func InitSettings() error {
 
 var settingCache = cache.NewCache(time.Minute, func(key string) (string, error) {
 	var s Setting
-	if err := cfg.DB().Where("`key` = ?", key).First(&s).Error; err != nil {
+	if err := cfg.DB().Where(&Setting{Key: key}).First(&s).Error; err != nil {
 		return "", err
 	}
 	return s.Value, nil
@@ -197,7 +197,7 @@ func GetSettingJSON(key string, v interface{}) error {
 func SetSetting(key, value, updatedBy string) error {
 	var s Setting
 	db := cfg.DB()
-	if err := db.Where("`key` = ?", key).First(&s).Error; err != nil {
+	if err := db.Where(&Setting{Key: key}).First(&s).Error; err != nil {
 		return err
 	}
 	s.Value = value