feat(admin): add Admin module with moderation, user mgmt, and dashboard

- Commands: ApproveListing, RejectListing, BanUser, AdjustSubscription
- Queries: GetModerationQueue, GetDashboardStats, GetRevenueStats
- Admin-only guards via @Roles('ADMIN') on all endpoints
- Prisma-based admin query repository for dashboard aggregations
- 14 unit tests covering all command handlers and query handlers
- Added activate() method to UserEntity for unban support

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/api/src/modules/subscriptions/domain/__tests__/subscription.entity.spec.ts

@@ -0,0 +1,96 @@
+import { SubscriptionEntity } from '../entities/subscription.entity';
+
+describe('SubscriptionEntity', () => {
+  const makeSub = (overrides?: Partial<Parameters<typeof SubscriptionEntity.createNew>[0]>) => {
+    return SubscriptionEntity.createNew(
+      'sub-1',
+      'user-1',
+      'plan-1',
+      'AGENT_PRO',
+      new Date('2026-01-01'),
+      new Date('2026-02-01'),
+    );
+  };
+
+  it('creates a new subscription with ACTIVE status', () => {
+    const sub = makeSub();
+    expect(sub.id).toBe('sub-1');
+    expect(sub.userId).toBe('user-1');
+    expect(sub.planTier).toBe('AGENT_PRO');
+    expect(sub.status).toBe('ACTIVE');
+    expect(sub.isActive()).toBe(true);
+    expect(sub.cancelledAt).toBeNull();
+  });
+
+  it('emits SubscriptionCreatedEvent on creation', () => {
+    const sub = makeSub();
+    const events = sub.domainEvents;
+    expect(events).toHaveLength(1);
+    expect(events[0].eventName).toBe('subscription.created');
+  });
+
+  it('upgrades plan tier', () => {
+    const sub = makeSub();
+    sub.clearDomainEvents();
+
+    sub.upgrade('plan-2', 'ENTERPRISE');
+
+    expect(sub.planId).toBe('plan-2');
+    expect(sub.planTier).toBe('ENTERPRISE');
+    const events = sub.domainEvents;
+    expect(events).toHaveLength(1);
+    expect(events[0].eventName).toBe('subscription.upgraded');
+  });
+
+  it('throws when upgrading non-active subscription', () => {
+    const sub = makeSub();
+    sub.cancel();
+
+    expect(() => sub.upgrade('plan-2', 'ENTERPRISE')).toThrow();
+  });
+
+  it('cancels subscription', () => {
+    const sub = makeSub();
+    sub.clearDomainEvents();
+
+    sub.cancel();
+
+    expect(sub.status).toBe('CANCELLED');
+    expect(sub.cancelledAt).not.toBeNull();
+    const events = sub.domainEvents;
+    expect(events).toHaveLength(1);
+    expect(events[0].eventName).toBe('subscription.cancelled');
+  });
+
+  it('throws when cancelling already cancelled subscription', () => {
+    const sub = makeSub();
+    sub.cancel();
+
+    expect(() => sub.cancel()).toThrow('Subscription đã bị hủy');
+  });
+
+  it('marks past due', () => {
+    const sub = makeSub();
+    sub.markPastDue();
+    expect(sub.status).toBe('PAST_DUE');
+  });
+
+  it('marks expired', () => {
+    const sub = makeSub();
+    sub.markExpired();
+    expect(sub.status).toBe('EXPIRED');
+  });
+
+  it('renews period', () => {
+    const sub = makeSub();
+    sub.markPastDue();
+
+    const newStart = new Date('2026-02-01');
+    const newEnd = new Date('2026-03-01');
+    sub.renewPeriod(newStart, newEnd);
+
+    expect(sub.status).toBe('ACTIVE');
+    expect(sub.currentPeriodStart).toEqual(newStart);
+    expect(sub.currentPeriodEnd).toEqual(newEnd);
+  });
+});