feat: 算力引擎 Go 后端核心（new-api）

- 统一 OpenAI 兼容 /v1 中继 + 渠道/额度/令牌/流水
- 各领域包：relay 模型网关、model 数据层、controller 管理 API

controller/pricing.go

@@ -0,0 +1,101 @@
+package controller
+
+import (
+	"github.com/QuantumNous/new-api/common"
+	"github.com/QuantumNous/new-api/model"
+	"github.com/QuantumNous/new-api/service"
+	"github.com/QuantumNous/new-api/setting/ratio_setting"
+
+	"github.com/gin-gonic/gin"
+)
+
+func filterPricingByUsableGroups(pricing []model.Pricing, usableGroup map[string]string) []model.Pricing {
+	if len(pricing) == 0 {
+		return pricing
+	}
+	if len(usableGroup) == 0 {
+		return []model.Pricing{}
+	}
+
+	filtered := make([]model.Pricing, 0, len(pricing))
+	for _, item := range pricing {
+		if common.StringsContains(item.EnableGroup, "all") {
+			filtered = append(filtered, item)
+			continue
+		}
+		for _, group := range item.EnableGroup {
+			if _, ok := usableGroup[group]; ok {
+				filtered = append(filtered, item)
+				break
+			}
+		}
+	}
+	return filtered
+}
+
+func GetPricing(c *gin.Context) {
+	pricing := model.GetPricing()
+	userId, exists := c.Get("id")
+	usableGroup := map[string]string{}
+	groupRatio := map[string]float64{}
+	for s, f := range ratio_setting.GetGroupRatioCopy() {
+		groupRatio[s] = f
+	}
+	var group string
+	if exists {
+		user, err := model.GetUserCache(userId.(int))
+		if err == nil {
+			group = user.Group
+			for g := range groupRatio {
+				ratio, ok := ratio_setting.GetGroupGroupRatio(group, g)
+				if ok {
+					groupRatio[g] = ratio
+				}
+			}
+		}
+	}
+
+	usableGroup = service.GetUserUsableGroups(group)
+	pricing = filterPricingByUsableGroups(pricing, usableGroup)
+	// check groupRatio contains usableGroup
+	for group := range ratio_setting.GetGroupRatioCopy() {
+		if _, ok := usableGroup[group]; !ok {
+			delete(groupRatio, group)
+		}
+	}
+
+	c.JSON(200, gin.H{
+		"success":            true,
+		"data":               pricing,
+		"vendors":            model.GetVendors(),
+		"group_ratio":        groupRatio,
+		"usable_group":       usableGroup,
+		"supported_endpoint": model.GetSupportedEndpointMap(),
+		"auto_groups":        service.GetUserAutoGroup(group),
+		"pricing_version":    "a42d372ccf0b5dd13ecf71203521f9d2",
+	})
+}
+
+func ResetModelRatio(c *gin.Context) {
+	defaultStr := ratio_setting.DefaultModelRatio2JSONString()
+	err := model.UpdateOption("ModelRatio", defaultStr)
+	if err != nil {
+		c.JSON(200, gin.H{
+			"success": false,
+			"message": err.Error(),
+		})
+		return
+	}
+	err = ratio_setting.UpdateModelRatioByJSONString(defaultStr)
+	if err != nil {
+		c.JSON(200, gin.H{
+			"success": false,
+			"message": err.Error(),
+		})
+		return
+	}
+	c.JSON(200, gin.H{
+		"success": true,
+		"message": "重置模型倍率成功",
+	})
+}