test: 完善自动化测试体系（7个模块，73个任务）

系统性地修复、补充和强化项目的自动化测试能力：

1. 测试基础设施修复
   - 修复 stubConcurrencyCache 缺失方法和构造函数参数不匹配
   - 创建 testutil 共享包（stubs.go, fixtures.go, httptest.go）
   - 为所有 Stub 添加编译期接口断言

2. 中间件测试补充
   - 新增 JWT 认证中间件测试（有效/过期/篡改/缺失 Token）
   - 补充 rate_limiter 和 recovery 中间件测试场景

3. 网关核心路径测试
   - 新增账户选择、等待队列、流式响应、并发控制、计费、Claude Code 检测测试
   - 覆盖负载均衡、粘性会话、SSE 转发、槽位管理等关键逻辑

4. 前端测试体系（11个新测试文件，163个测试用例）
   - Pinia stores: auth, app, subscriptions
   - API client: 请求拦截器、响应拦截器、401 刷新
   - Router guards: 认证重定向、管理员权限、简易模式限制
   - Composables: useForm, useTableLoader, useClipboard
   - Components: LoginForm, ApiKeyCreate, Dashboard

5. CI/CD 流水线重构
   - 重构 backend-ci.yml 为统一的 ci.yml
   - 前后端 4 个并行 Job + Postgres/Redis services
   - Race 检测、覆盖率收集与门禁、Docker 构建验证

6. E2E 自动化测试
   - e2e-test.sh 自动化脚本（Docker 启动→健康检查→测试→清理）
   - 用户注册→登录→API Key→网关调用完整链路测试
   - Mock 模式和 API Key 脱敏支持

7. 修复预存问题
   - tlsfingerprint dialer_test.go 缺失 build tag 导致集成测试编译冲突

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

backend/internal/handler/sora_gateway_handler_test.go

@@ -16,10 +16,17 @@ import (
 	"github.com/Wei-Shaw/sub2api/internal/pkg/usagestats"
 	"github.com/Wei-Shaw/sub2api/internal/server/middleware"
 	"github.com/Wei-Shaw/sub2api/internal/service"
+	"github.com/Wei-Shaw/sub2api/internal/testutil"
 	"github.com/gin-gonic/gin"
 	"github.com/stretchr/testify/require"
 )
 
+// 编译期接口断言
+var _ service.SoraClient = (*stubSoraClient)(nil)
+var _ service.AccountRepository = (*stubAccountRepo)(nil)
+var _ service.GroupRepository = (*stubGroupRepo)(nil)
+var _ service.UsageLogRepository = (*stubUsageLogRepo)(nil)
+
 type stubSoraClient struct {
 	imageURLs []string
 }
@@ -41,52 +48,6 @@ func (s *stubSoraClient) GetVideoTask(ctx context.Context, account *service.Acco
 	return &service.SoraVideoTaskStatus{ID: taskID, Status: "completed", URLs: s.imageURLs}, nil
 }
 
-type stubConcurrencyCache struct{}
-
-func (c stubConcurrencyCache) AcquireAccountSlot(ctx context.Context, accountID int64, maxConcurrency int, requestID string) (bool, error) {
-	return true, nil
-}
-func (c stubConcurrencyCache) ReleaseAccountSlot(ctx context.Context, accountID int64, requestID string) error {
-	return nil
-}
-func (c stubConcurrencyCache) GetAccountConcurrency(ctx context.Context, accountID int64) (int, error) {
-	return 0, nil
-}
-func (c stubConcurrencyCache) IncrementAccountWaitCount(ctx context.Context, accountID int64, maxWait int) (bool, error) {
-	return true, nil
-}
-func (c stubConcurrencyCache) DecrementAccountWaitCount(ctx context.Context, accountID int64) error {
-	return nil
-}
-func (c stubConcurrencyCache) GetAccountWaitingCount(ctx context.Context, accountID int64) (int, error) {
-	return 0, nil
-}
-func (c stubConcurrencyCache) AcquireUserSlot(ctx context.Context, userID int64, maxConcurrency int, requestID string) (bool, error) {
-	return true, nil
-}
-func (c stubConcurrencyCache) ReleaseUserSlot(ctx context.Context, userID int64, requestID string) error {
-	return nil
-}
-func (c stubConcurrencyCache) GetUserConcurrency(ctx context.Context, userID int64) (int, error) {
-	return 0, nil
-}
-func (c stubConcurrencyCache) IncrementWaitCount(ctx context.Context, userID int64, maxWait int) (bool, error) {
-	return true, nil
-}
-func (c stubConcurrencyCache) DecrementWaitCount(ctx context.Context, userID int64) error {
-	return nil
-}
-func (c stubConcurrencyCache) GetAccountsLoadBatch(ctx context.Context, accounts []service.AccountWithConcurrency) (map[int64]*service.AccountLoadInfo, error) {
-	result := make(map[int64]*service.AccountLoadInfo, len(accounts))
-	for _, acc := range accounts {
-		result[acc.ID] = &service.AccountLoadInfo{AccountID: acc.ID, LoadRate: 0}
-	}
-	return result, nil
-}
-func (c stubConcurrencyCache) CleanupExpiredAccountSlots(ctx context.Context, accountID int64) error {
-	return nil
-}
-
 type stubAccountRepo struct {
 	accounts map[int64]*service.Account
 }
@@ -260,6 +221,12 @@ func (r *stubGroupRepo) GetAccountCount(ctx context.Context, groupID int64) (int
 func (r *stubGroupRepo) DeleteAccountGroupsByGroupID(ctx context.Context, groupID int64) (int64, error) {
 	return 0, nil
 }
+func (r *stubGroupRepo) GetAccountIDsByGroupIDs(ctx context.Context, groupIDs []int64) ([]int64, error) {
+	return nil, nil
+}
+func (r *stubGroupRepo) BindAccountsToGroup(ctx context.Context, groupID int64, accountIDs []int64) error {
+	return nil
+}
 
 type stubUsageLogRepo struct{}
 
@@ -312,15 +279,18 @@ func (s *stubUsageLogRepo) GetAPIKeyUsageTrend(ctx context.Context, startTime, e
 func (s *stubUsageLogRepo) GetUserUsageTrend(ctx context.Context, startTime, endTime time.Time, granularity string, limit int) ([]usagestats.UserUsageTrendPoint, error) {
 	return nil, nil
 }
-func (s *stubUsageLogRepo) GetBatchUserUsageStats(ctx context.Context, userIDs []int64) (map[int64]*usagestats.BatchUserUsageStats, error) {
+func (s *stubUsageLogRepo) GetBatchUserUsageStats(ctx context.Context, userIDs []int64, startTime, endTime time.Time) (map[int64]*usagestats.BatchUserUsageStats, error) {
 	return nil, nil
 }
-func (s *stubUsageLogRepo) GetBatchAPIKeyUsageStats(ctx context.Context, apiKeyIDs []int64) (map[int64]*usagestats.BatchAPIKeyUsageStats, error) {
+func (s *stubUsageLogRepo) GetBatchAPIKeyUsageStats(ctx context.Context, apiKeyIDs []int64, startTime, endTime time.Time) (map[int64]*usagestats.BatchAPIKeyUsageStats, error) {
 	return nil, nil
 }
 func (s *stubUsageLogRepo) GetUserDashboardStats(ctx context.Context, userID int64) (*usagestats.UserDashboardStats, error) {
 	return nil, nil
 }
+func (s *stubUsageLogRepo) GetAPIKeyDashboardStats(ctx context.Context, apiKeyID int64) (*usagestats.UserDashboardStats, error) {
+	return nil, nil
+}
 func (s *stubUsageLogRepo) GetUserUsageTrendByUserID(ctx context.Context, userID int64, startTime, endTime time.Time, granularity string) ([]usagestats.TrendDataPoint, error) {
 	return nil, nil
 }
@@ -384,7 +354,7 @@ func TestSoraGatewayHandler_ChatCompletions(t *testing.T) {
 	usageLogRepo := &stubUsageLogRepo{}
 	deferredService := service.NewDeferredService(accountRepo, nil, 0)
 	billingService := service.NewBillingService(cfg, nil)
-	concurrencyService := service.NewConcurrencyService(stubConcurrencyCache{})
+	concurrencyService := service.NewConcurrencyService(testutil.StubConcurrencyCache{})
 	billingCacheService := service.NewBillingCacheService(nil, nil, nil, cfg)
 	t.Cleanup(func() {
 		billingCacheService.Stop()
@@ -397,6 +367,7 @@ func TestSoraGatewayHandler_ChatCompletions(t *testing.T) {
 		nil,
 		nil,
 		nil,
+		nil,
 		cfg,
 		nil,
 		concurrencyService,