fix: resolve golangci-lint errors (gofmt, staticcheck, unused)

- Fix struct field alignment in dto/types.go, settings_view.go,
  sora_generation_service.go for gofmt compliance
- Remove embedded field "Account" from selector in account_handler.go (QF1008)
- Remove unused settingService field from SoraGDriveOAuthService
- Replace deprecated google.CredentialsFromJSON with CredentialsFromJSONWithParams (SA1019)

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

backend/internal/handler/admin/account_handler.go

@@ -213,8 +213,8 @@ func (h *AccountHandler) buildAccountResponseWithRuntime(ctx context.Context, ac
 		if clients, err := h.gatewayCache.GetAccountAffinityClientsBatch(ctx, accountGroups, service.ClientAffinityTTL); err == nil {
 			if cl, ok := clients[account.ID]; ok {
 				count := int64(len(cl))
-				item.Account.AffinityClientCount = &count
-				item.Account.AffinityClients = cl
+				item.AffinityClientCount = &count
+				item.AffinityClients = cl
 			}
 		}
 	}
@@ -396,8 +396,8 @@ func (h *AccountHandler) List(c *gin.Context) {
 		if affinityClients != nil {
 			if clients, ok := affinityClients[acc.ID]; ok {
 				count := int64(len(clients))
-				item.Account.AffinityClientCount = &count
-				item.Account.AffinityClients = clients
+				item.AffinityClientCount = &count
+				item.AffinityClients = clients
 			}
 		}
 

backend/internal/handler/dto/types.go

@@ -193,14 +193,14 @@ type Account struct {
 	ClientAffinityEnabled *bool `json:"client_affinity_enabled,omitempty"`
 
 	// 亲和客户端数据（仅 admin 列表端点注入，不由 mapper 填充）
-	AffinityClientCount *int64   `json:"affinity_client_count,omitempty"`
+	AffinityClientCount *int64    `json:"affinity_client_count,omitempty"`
 	AffinityClients     []string `json:"affinity_clients,omitempty"`
 
 	// API Key 账号配额限制
-	QuotaLimit      *float64 `json:"quota_limit,omitempty"`
-	QuotaUsed       *float64 `json:"quota_used,omitempty"`
-	QuotaDailyLimit *float64 `json:"quota_daily_limit,omitempty"`
-	QuotaDailyUsed  *float64 `json:"quota_daily_used,omitempty"`
+	QuotaLimit       *float64 `json:"quota_limit,omitempty"`
+	QuotaUsed        *float64 `json:"quota_used,omitempty"`
+	QuotaDailyLimit  *float64 `json:"quota_daily_limit,omitempty"`
+	QuotaDailyUsed   *float64 `json:"quota_daily_used,omitempty"`
 	QuotaWeeklyLimit *float64 `json:"quota_weekly_limit,omitempty"`
 	QuotaWeeklyUsed  *float64 `json:"quota_weekly_used,omitempty"`
 

backend/internal/service/settings_view.go

@@ -140,7 +140,7 @@ type SoraS3Profile struct {
 	UpdatedAt                 string `json:"updated_at"`
 
 	// --- Google Drive 专属 ---
-	AuthType                 string `json:"auth_type,omitempty"`    // "oauth2" / "service_account"
+	AuthType                 string `json:"auth_type,omitempty"` // "oauth2" / "service_account"
 	ClientID                 string `json:"client_id,omitempty"`
 	ClientSecret             string `json:"-"`
 	ClientSecretConfigured   bool   `json:"client_secret_configured"`

backend/internal/service/sora_gdrive_oauth.go

@@ -12,15 +12,11 @@ import (
 )
 
 // SoraGDriveOAuthService 处理 Google Drive OAuth2 授权流程。
-type SoraGDriveOAuthService struct {
-	settingService *SettingService
-}
+type SoraGDriveOAuthService struct{}
 
 // NewSoraGDriveOAuthService 创建 GDrive OAuth 服务。
-func NewSoraGDriveOAuthService(settingService *SettingService) *SoraGDriveOAuthService {
-	return &SoraGDriveOAuthService{
-		settingService: settingService,
-	}
+func NewSoraGDriveOAuthService(_ *SettingService) *SoraGDriveOAuthService {
+	return &SoraGDriveOAuthService{}
 }
 
 // GenerateAuthURL 生成 Google OAuth 授权 URL。

backend/internal/service/sora_gdrive_storage.go

@@ -153,7 +153,9 @@ func (s *SoraGDriveStorage) buildOAuth2Service(ctx context.Context, profile *Sor
 }
 
 func (s *SoraGDriveStorage) buildServiceAccountService(ctx context.Context, profile *SoraS3Profile) (*drive.Service, error) {
-	creds, err := google.CredentialsFromJSON(ctx, []byte(profile.ServiceAccountJSON), drive.DriveFileScope)
+	creds, err := google.CredentialsFromJSONWithParams(ctx, []byte(profile.ServiceAccountJSON), google.CredentialsParams{
+		Scopes: []string{drive.DriveFileScope},
+	})
 	if err != nil {
 		return nil, fmt.Errorf("parse service account json: %w", err)
 	}

backend/internal/service/sora_generation_service.go

@@ -35,9 +35,9 @@ type soraGenerationRepoConditionalUpdater interface {
 
 // SoraGenerationService 管理 Sora 客户端的生成记录 CRUD。
 type SoraGenerationService struct {
-	genRepo        SoraGenerationRepository
-	objectStorage  SoraObjectStorage
-	quotaService   *SoraQuotaService
+	genRepo       SoraGenerationRepository
+	objectStorage SoraObjectStorage
+	quotaService  *SoraQuotaService
 }
 
 // NewSoraGenerationService 创建生成记录服务。