feat(rfa): complete RFA Approval Refactor - all 9 phases (T001-T080)

Phase 1-2: Setup, SQL schema, enums, queue constants, base entities
Phase 3 (US1): ReviewTeam, ReviewTeamMember, ReviewTask, TaskCreationService
Phase 4 (US2): ResponseCode, ResponseCodeRule, ImplicationsService, NotificationTriggerService
Phase 5 (US3): Delegation entity, CircularDetectionService, DelegationService/Controller/Module
Phase 6 (US4): ReminderRule, SchedulerService, EscalationService, ReminderProcessor, ReminderModule
Phase 7 (US5): DistributionMatrix, DistributionRecipient, ApprovalListenerService (Strangler),
               TransmittalCreatorService, DistributionProcessor, DistributionModule
Phase 8 (US6): MatrixManagementService, InheritanceService (global→project override)
Phase 9 (Polish): AggregateStatusService, ConsensusService, VetoOverrideService,
                  ParallelGatewayHandler, review-validators, optimistic locking in completeReview,
                  test stubs (unit/integration/e2e), jest.config.js updated for tests/ directory

Frontend: ReviewTaskInbox, ParallelProgress, VetoOverrideDialog, DelegationForm,
          DelegatedBadge, MatrixEditor, ProjectOverrideManager, DistributionStatus,
          ReminderHistory, ResponseCodeSelector, CodeImplications, CompleteReviewForm,
          ReviewTeamForm, ReviewTeamSelector, TeamMemberManager

Closes #1

backend/src/app.module.ts

@@ -53,6 +53,11 @@ import { AuditLogModule } from './modules/audit-log/audit-log.module';
 import { MigrationModule } from './modules/migration/migration.module';
 import { AiModule } from './modules/ai/ai.module';
 import { RagModule } from './modules/rag/rag.module';
+import { ReviewTeamModule } from './modules/review-team/review-team.module';
+import { ResponseCodeModule } from './modules/response-code/response-code.module';
+import { DelegationModule } from './modules/delegation/delegation.module';
+import { ReminderModule } from './modules/reminder/reminder.module';
+import { DistributionModule } from './modules/distribution/distribution.module';
 
 @Module({
   imports: [
@@ -191,6 +196,11 @@ import { RagModule } from './modules/rag/rag.module';
     MigrationModule,
     AiModule,
     RagModule,
+    ReviewTeamModule,
+    ResponseCodeModule,
+    DelegationModule,
+    ReminderModule,
+    DistributionModule,
   ],
   controllers: [AppController],
   providers: [