fix(billing): 修复 OpenAI fast 档位计费并补齐展示

- 打通 service_tier 在 OpenAI HTTP、WS、passthrough 与 usage 记录中的传递
- 修正 priority/flex 计费逻辑，并将 fast 归一化为 priority
- 在用户端和管理端补齐服务档位与计费明细展示
- 补齐前后端测试，并修复 WS 限流信号重复持久化导致的全量回归失败

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/internal/handler/dto/mappers.go

@@ -475,6 +475,7 @@ func usageLogFromServiceUser(l *service.UsageLog) UsageLog {
 		AccountID:             l.AccountID,
 		RequestID:             l.RequestID,
 		Model:                 l.Model,
+		ServiceTier:           l.ServiceTier,
 		ReasoningEffort:       l.ReasoningEffort,
 		GroupID:               l.GroupID,
 		SubscriptionID:        l.SubscriptionID,

backend/internal/handler/dto/mappers_usage_test.go

@@ -71,3 +71,29 @@ func TestRequestTypeStringPtrNil(t *testing.T) {
 	t.Parallel()
 	require.Nil(t, requestTypeStringPtr(nil))
 }
+
+func TestUsageLogFromService_IncludesServiceTierForUserAndAdmin(t *testing.T) {
+	t.Parallel()
+
+	serviceTier := "priority"
+	log := &service.UsageLog{
+		RequestID:             "req_3",
+		Model:                 "gpt-5.4",
+		ServiceTier:           &serviceTier,
+		AccountRateMultiplier: f64Ptr(1.5),
+	}
+
+	userDTO := UsageLogFromService(log)
+	adminDTO := UsageLogFromServiceAdmin(log)
+
+	require.NotNil(t, userDTO.ServiceTier)
+	require.Equal(t, serviceTier, *userDTO.ServiceTier)
+	require.NotNil(t, adminDTO.ServiceTier)
+	require.Equal(t, serviceTier, *adminDTO.ServiceTier)
+	require.NotNil(t, adminDTO.AccountRateMultiplier)
+	require.InDelta(t, 1.5, *adminDTO.AccountRateMultiplier, 1e-12)
+}
+
+func f64Ptr(value float64) *float64 {
+	return &value
+}

backend/internal/handler/dto/types.go

@@ -315,6 +315,8 @@ type UsageLog struct {
 	AccountID int64  `json:"account_id"`
 	RequestID string `json:"request_id"`
 	Model     string `json:"model"`
+	// ServiceTier records the OpenAI service tier used for billing, e.g. "priority" / "flex".
+	ServiceTier *string `json:"service_tier,omitempty"`
 	// ReasoningEffort is the request's reasoning effort level (OpenAI Responses API).
 	// nil means not provided / not applicable.
 	ReasoningEffort *string `json:"reasoning_effort,omitempty"`