优化后端可以编辑皮肤等等

backend/internal/modules/systemconfig/repository.go

@@ -38,6 +38,7 @@ var defaultConfigs = []defaultConfig{
 	{Key: "settlement.platform_fee_rate", Value: "0.00", Description: "平台抽成比例"},
 	{Key: "settlement.owner_cycle_days", Value: "0", Description: "号主结算周期天数"},
 	{Key: "withdraw.min_amount", Value: "100", Description: "提现最低金额预留"},
+	{Key: publishOptionsConfigKey, Value: defaultPublishOptionsConfigValue(), Description: "发布页选项配置 JSON"},
 }
 
 func NewRepository(db *gorm.DB) *Repository {
@@ -59,6 +60,17 @@ func (r *Repository) List() ([]ConfigDTO, error) {
 	return items, nil
 }
 
+func (r *Repository) FindValue(key string) (string, error) {
+	if err := r.ensureDefaults(); err != nil {
+		return "", err
+	}
+	var row model.SystemConfig
+	if err := r.db.Where("`key` = ?", key).First(&row).Error; err != nil {
+		return "", err
+	}
+	return row.Value, nil
+}
+
 func (r *Repository) Update(actorID uint64, key string, req UpdateRequest, meta AuditMeta) (*ConfigDTO, error) {
 	var row model.SystemConfig
 	err := r.db.Transaction(func(tx *gorm.DB) error {