refactor: rename and relocate HasModelBillingConfig function for clarity

model/pricing.go

@@ -86,20 +86,6 @@ func InvalidatePricingCache() {
 	lastGetPricingTime = time.Time{}
 }
 
-func HasModelBillingConfig(modelName string) bool {
-	if _, ok := ratio_setting.GetModelPrice(modelName, false); ok {
-		return true
-	}
-	if _, ok, _ := ratio_setting.GetModelRatio(modelName); ok {
-		return true
-	}
-	if billing_setting.GetBillingMode(modelName) != billing_setting.BillingModeTieredExpr {
-		return false
-	}
-	expr, ok := billing_setting.GetBillingExpr(modelName)
-	return ok && strings.TrimSpace(expr) != ""
-}
-
 // GetVendors 返回当前定价接口使用到的供应商信息
 func GetVendors() []PricingVendor {
 	if time.Since(lastGetPricingTime) > time.Minute*1 || len(pricingMap) == 0 {