refactor(usage): 移动 usage 查询到 services

backend/internal/service/account_usage_service.go

@@ -8,6 +8,7 @@ import (
 	"time"
 
 	"sub2api/internal/model"
+	"sub2api/internal/pkg/usagestats"
 	"sub2api/internal/service/ports"
 )
 
@@ -176,6 +177,14 @@ func (s *AccountUsageService) GetTodayStats(ctx context.Context, accountID int64
 	}, nil
 }
 
+func (s *AccountUsageService) GetAccountUsageStats(ctx context.Context, accountID int64, startTime, endTime time.Time) (*usagestats.AccountUsageStatsResponse, error) {
+	stats, err := s.usageLogRepo.GetAccountUsageStats(ctx, accountID, startTime, endTime)
+	if err != nil {
+		return nil, fmt.Errorf("get account usage stats failed: %w", err)
+	}
+	return stats, nil
+}
+
 // fetchOAuthUsage 从Anthropic API获取OAuth账号的使用量
 func (s *AccountUsageService) fetchOAuthUsage(ctx context.Context, account *model.Account) (*UsageInfo, error) {
 	accessToken := account.GetCredential("access_token")