Return free Fast in admin responses

backend/internal/handler/dto/group_mapper_openai_fast_test.go

@@ -10,14 +10,16 @@ import (
 
 func TestGroupMapperExposesForceOpenAIFastOnlyToAdmins(t *testing.T) {
 	group := &service.Group{
-		ID: 7, Name: "fast", Platform: service.PlatformOpenAI, Status: service.StatusActive, ForceOpenAIFast: true,
+		ID: 7, Name: "fast", Platform: service.PlatformOpenAI, Status: service.StatusActive, ForceOpenAIFast: true, FreeOpenAIFast: true,
 	}
 
 	userJSON, err := json.Marshal(GroupFromService(group))
 	require.NoError(t, err)
 	require.NotContains(t, string(userJSON), "force_openai_fast")
+	require.NotContains(t, string(userJSON), "free_openai_fast")
 
 	adminJSON, err := json.Marshal(GroupFromServiceAdmin(group))
 	require.NoError(t, err)
 	require.Contains(t, string(adminJSON), `"force_openai_fast":true`)
+	require.Contains(t, string(adminJSON), `"free_openai_fast":true`)
 }

backend/internal/handler/dto/mappers.go

@@ -149,6 +149,7 @@ func GroupFromServiceAdmin(g *service.Group) *AdminGroup {
 	out := &AdminGroup{
 		Group:                       groupFromServiceBase(g),
 		ForceOpenAIFast:             g.ForceOpenAIFast,
+		FreeOpenAIFast:              g.FreeOpenAIFast,
 		ProfitControlEnabled:        g.ProfitControlEnabled,
 		ProfitMinMargin:             g.ProfitMinMargin,
 		ProfitSafetyBuffer:          g.ProfitSafetyBuffer,

backend/internal/handler/dto/types.go

@@ -166,6 +166,8 @@ type AdminGroup struct {
 	Group
 	// ForceOpenAIFast 是管理端请求策略，用户侧分组 DTO 无需暴露。
 	ForceOpenAIFast bool `json:"force_openai_fast"`
+	// FreeOpenAIFast 是管理端计费策略，用户侧分组 DTO 无需暴露。
+	FreeOpenAIFast bool `json:"free_openai_fast"`
 
 	// 分组利润控制（五个 token 平台分组可启用；margin/buffer 为小数存储）。
 	// 仅管理员可见：这三个字段与同响应中的 rate_multiplier 相乘即可反推出