💱 feat(settings): introduce site-wide quota display type (USD/CNY/TOKENS/CUSTOM)

Replace the legacy boolean “DisplayInCurrencyEnabled” with an injected, type-safe
configuration `general_setting.quota_display_type`, and wire it through the
backend and frontend.

Backend
- Add `QuotaDisplayType` to `operation_setting.GeneralSetting` with injected
  registration via `config.GlobalConfig.Register("general_setting", ...)`.
  Helpers: `IsCurrencyDisplay()`, `IsCNYDisplay()`, `GetQuotaDisplayType()`.
- Expose `quota_display_type` in `/api/status` and keep legacy
  `display_in_currency` for backward compatibility.
- Logger: update `LogQuota` and `FormatQuota` to support USD/CNY/TOKENS. When
  CNY is selected, convert using `operation_setting.USDExchangeRate`.
- Controllers:
  - `billing`: compute subscription/usage amounts based on the selected type
    (USD: divide by `QuotaPerUnit`; CNY: USD→CNY; TOKENS: keep raw tokens).
  - `topup` / `topup_stripe`: treat inputs as “amount” for USD/CNY and as
    token-count for TOKENS; adjust min topup and pay money accordingly.
  - `misc`: include `quota_display_type` in status payload.
- Compatibility: in `model/option.UpdateOption`, map updates to
  `DisplayInCurrencyEnabled` → `general_setting.quota_display_type`
  (true→USD, false→TOKENS). Keep exporting the legacy key in `OptionMap`.

Frontend
- Settings: replace the “display in currency” switch with a Select
  (`general_setting.quota_display_type`) offering USD / CNY / Tokens.
  Provide fallback mapping from legacy `DisplayInCurrencyEnabled`.
- Persist `quota_display_type` to localStorage (keep `display_in_currency`
  for legacy components).
- Rendering helpers: base all quota/price rendering on `quota_display_type`;
  use `usd_exchange_rate` for CNY symbol/values.
- Pricing page: default view currency follows site display type (USD/CNY),
  while TOKENS mode still allows per-view currency toggling when needed.

Notes
- No database migrations required.
- Legacy clients remain functional via compatibility fields.

controller/billing.go

@@ -5,6 +5,7 @@ import (
 	"one-api/common"
 	"one-api/dto"
 	"one-api/model"
+	"one-api/setting/operation_setting"
 )
 
 func GetSubscription(c *gin.Context) {
@@ -39,8 +40,18 @@ func GetSubscription(c *gin.Context) {
 	}
 	quota := remainQuota + usedQuota
 	amount := float64(quota)
-	if common.DisplayInCurrencyEnabled {
-		amount /= common.QuotaPerUnit
+	// OpenAI 兼容接口中的 *_USD 字段含义保持“额度单位”对应值：
+	// 我们将其解释为以“站点展示类型”为准：
+	// - USD: 直接除以 QuotaPerUnit
+	// - CNY: 先转 USD 再乘汇率
+	// - TOKENS: 直接使用 tokens 数量
+	switch operation_setting.GetQuotaDisplayType() {
+	case operation_setting.QuotaDisplayTypeCNY:
+		amount = amount / common.QuotaPerUnit * operation_setting.USDExchangeRate
+	case operation_setting.QuotaDisplayTypeTokens:
+		// amount 保持 tokens 数值
+	default:
+		amount = amount / common.QuotaPerUnit
 	}
 	if token != nil && token.UnlimitedQuota {
 		amount = 100000000
@@ -80,8 +91,13 @@ func GetUsage(c *gin.Context) {
 		return
 	}
 	amount := float64(quota)
-	if common.DisplayInCurrencyEnabled {
-		amount /= common.QuotaPerUnit
+	switch operation_setting.GetQuotaDisplayType() {
+	case operation_setting.QuotaDisplayTypeCNY:
+		amount = amount / common.QuotaPerUnit * operation_setting.USDExchangeRate
+	case operation_setting.QuotaDisplayTypeTokens:
+		// tokens 保持原值
+	default:
+		amount = amount / common.QuotaPerUnit
 	}
 	usage := OpenAIUsageResponse{
 		Object:     "list",

controller/misc.go

@@ -64,18 +64,22 @@ func GetStatus(c *gin.Context) {
 		"top_up_link":                 common.TopUpLink,
 		"docs_link":                   operation_setting.GetGeneralSetting().DocsLink,
 		"quota_per_unit":              common.QuotaPerUnit,
-		"display_in_currency":         common.DisplayInCurrencyEnabled,
-		"enable_batch_update":         common.BatchUpdateEnabled,
-		"enable_drawing":              common.DrawingEnabled,
-		"enable_task":                 common.TaskEnabled,
-		"enable_data_export":          common.DataExportEnabled,
-		"data_export_default_time":    common.DataExportDefaultTime,
-		"default_collapse_sidebar":    common.DefaultCollapseSidebar,
-		"mj_notify_enabled":           setting.MjNotifyEnabled,
-		"chats":                       setting.Chats,
-		"demo_site_enabled":           operation_setting.DemoSiteEnabled,
-		"self_use_mode_enabled":       operation_setting.SelfUseModeEnabled,
-		"default_use_auto_group":      setting.DefaultUseAutoGroup,
+		// 兼容旧前端：保留 display_in_currency，同时提供新的 quota_display_type
+		"display_in_currency":           operation_setting.IsCurrencyDisplay(),
+		"quota_display_type":            operation_setting.GetQuotaDisplayType(),
+		"custom_currency_symbol":        operation_setting.GetGeneralSetting().CustomCurrencySymbol,
+		"custom_currency_exchange_rate": operation_setting.GetGeneralSetting().CustomCurrencyExchangeRate,
+		"enable_batch_update":           common.BatchUpdateEnabled,
+		"enable_drawing":                common.DrawingEnabled,
+		"enable_task":                   common.TaskEnabled,
+		"enable_data_export":            common.DataExportEnabled,
+		"data_export_default_time":      common.DataExportDefaultTime,
+		"default_collapse_sidebar":      common.DefaultCollapseSidebar,
+		"mj_notify_enabled":             setting.MjNotifyEnabled,
+		"chats":                         setting.Chats,
+		"demo_site_enabled":             operation_setting.DemoSiteEnabled,
+		"self_use_mode_enabled":         operation_setting.SelfUseModeEnabled,
+		"default_use_auto_group":        setting.DefaultUseAutoGroup,
 
 		"usd_exchange_rate": operation_setting.USDExchangeRate,
 		"price":             operation_setting.Price,

controller/setup.go

@@ -178,4 +178,4 @@ func boolToString(b bool) string {
 		return "true"
 	}
 	return "false"
-}
+}

controller/topup.go

@@ -86,8 +86,9 @@ func GetEpayClient() *epay.Client {
 
 func getPayMoney(amount int64, group string) float64 {
 	dAmount := decimal.NewFromInt(amount)
-
-	if !common.DisplayInCurrencyEnabled {
+	// 充值金额以“展示类型”为准：
+	// - USD/CNY: 前端传 amount 为金额单位；TOKENS: 前端传 tokens，需要换成 USD 金额
+	if operation_setting.GetQuotaDisplayType() == operation_setting.QuotaDisplayTypeTokens {
 		dQuotaPerUnit := decimal.NewFromFloat(common.QuotaPerUnit)
 		dAmount = dAmount.Div(dQuotaPerUnit)
 	}
@@ -115,7 +116,7 @@ func getPayMoney(amount int64, group string) float64 {
 
 func getMinTopup() int64 {
 	minTopup := operation_setting.MinTopUp
-	if !common.DisplayInCurrencyEnabled {
+	if operation_setting.GetQuotaDisplayType() == operation_setting.QuotaDisplayTypeTokens {
 		dMinTopup := decimal.NewFromInt(int64(minTopup))
 		dQuotaPerUnit := decimal.NewFromFloat(common.QuotaPerUnit)
 		minTopup = int(dMinTopup.Mul(dQuotaPerUnit).IntPart())
@@ -176,7 +177,7 @@ func RequestEpay(c *gin.Context) {
 		return
 	}
 	amount := req.Amount
-	if !common.DisplayInCurrencyEnabled {
+	if operation_setting.GetQuotaDisplayType() == operation_setting.QuotaDisplayTypeTokens {
 		dAmount := decimal.NewFromInt(int64(amount))
 		dQuotaPerUnit := decimal.NewFromFloat(common.QuotaPerUnit)
 		amount = dAmount.Div(dQuotaPerUnit).IntPart()

controller/topup_stripe.go

@@ -258,7 +258,7 @@ func GetChargedAmount(count float64, user model.User) float64 {
 
 func getStripePayMoney(amount float64, group string) float64 {
 	originalAmount := amount
-	if !common.DisplayInCurrencyEnabled {
+	if operation_setting.GetQuotaDisplayType() == operation_setting.QuotaDisplayTypeTokens {
 		amount = amount / common.QuotaPerUnit
 	}
 	// Using float64 for monetary calculations is acceptable here due to the small amounts involved
@@ -279,7 +279,7 @@ func getStripePayMoney(amount float64, group string) float64 {
 
 func getStripeMinTopup() int64 {
 	minTopup := setting.StripeMinTopUp
-	if !common.DisplayInCurrencyEnabled {
+	if operation_setting.GetQuotaDisplayType() == operation_setting.QuotaDisplayTypeTokens {
 		minTopup = minTopup * int(common.QuotaPerUnit)
 	}
 	return int64(minTopup)