fix(test): 修复测试和添加数据库迁移

测试修复：
- 修复集成测试中的重复键冲突问题
- 移除 JSON 中多余的尾随逗号
- 新增 inprocess_transport_test.go
- 更新 haiku 模型映射测试用例

数据库迁移：
- 026: 运营指标聚合表
- 027: 使用量与计费一致性约束

backend/internal/service/gemini_multiplatform_test.go

@@ -121,6 +121,12 @@ func (m *mockAccountRepoForGemini) SetRateLimited(ctx context.Context, id int64,
 func (m *mockAccountRepoForGemini) SetOverloaded(ctx context.Context, id int64, until time.Time) error {
 	return nil
 }
+func (m *mockAccountRepoForGemini) SetTempUnschedulable(ctx context.Context, id int64, until time.Time, reason string) error {
+	return nil
+}
+func (m *mockAccountRepoForGemini) ClearTempUnschedulable(ctx context.Context, id int64) error {
+	return nil
+}
 func (m *mockAccountRepoForGemini) ClearRateLimit(ctx context.Context, id int64) error { return nil }
 func (m *mockAccountRepoForGemini) UpdateSessionWindow(ctx context.Context, id int64, start, end *time.Time, status string) error {
 	return nil
@@ -275,7 +281,7 @@ func TestGeminiMessagesCompatService_SelectAccountForModelWithExclusions_OAuthPr
 
 	repo := &mockAccountRepoForGemini{
 		accounts: []Account{
-			{ID: 1, Platform: PlatformGemini, Type: AccountTypeAPIKey, Priority: 1, Status: StatusActive, Schedulable: true, LastUsedAt: nil},
+			{ID: 1, Platform: PlatformGemini, Type: AccountTypeApiKey, Priority: 1, Status: StatusActive, Schedulable: true, LastUsedAt: nil},
 			{ID: 2, Platform: PlatformGemini, Type: AccountTypeOAuth, Priority: 1, Status: StatusActive, Schedulable: true, LastUsedAt: nil},
 		},
 		accountsByID: map[int64]*Account{},

backend/internal/service/token_refresher_test.go

@@ -197,7 +197,7 @@ func TestClaudeTokenRefresher_CanRefresh(t *testing.T) {
 		{
 			name:     "anthropic api-key - cannot refresh",
 			platform: PlatformAnthropic,
-			accType:  AccountTypeAPIKey,
+			accType:  AccountTypeApiKey,
 			want:     false,
 		},
 		{