test(integration): add lightweight MySQL-backed API smoke tests for center and guild

Fabric.Backend.Center/src/entities/audit-log.entity.ts

@@ -8,13 +8,13 @@ export class AuditLog {
   @Column()
   action!: string;
 
-  @Column({ nullable: true })
+  @Column({ type: 'varchar', length: 64, nullable: true })
   actorId!: string | null;
 
-  @Column({ nullable: true })
+  @Column({ type: 'varchar', length: 64, nullable: true })
   targetType!: string | null;
 
-  @Column({ nullable: true })
+  @Column({ type: 'varchar', length: 120, nullable: true })
   targetId!: string | null;
 
   @Column({ type: 'text', nullable: true })

Fabric.Backend.Center/src/health.integration.spec.ts

@@ -0,0 +1,40 @@
+import { INestApplication } from '@nestjs/common';
+import { Test } from '@nestjs/testing';
+import request from 'supertest';
+import { afterAll, beforeAll, describe, expect, it } from 'vitest';
+
+process.env.DB_HOST = '127.0.0.1';
+process.env.DB_PORT = '3307';
+process.env.DB_USER = 'fabric';
+process.env.DB_PASSWORD = 'fabric';
+process.env.DB_NAME = 'fabric_center';
+process.env.DB_SYNC = 'false';
+process.env.CENTER_SHARED_SECRET = 'test-center-secret';
+process.env.JWT_ACCESS_SECRET = 'test-access-secret';
+process.env.JWT_REFRESH_SECRET = 'test-refresh-secret';
+
+describe('center integration (mysql + api)', () => {
+  let app: INestApplication;
+
+  beforeAll(async () => {
+    const { AppModule } = await import('./app.module');
+    const moduleRef = await Test.createTestingModule({
+      imports: [AppModule],
+    }).compile();
+
+    app = moduleRef.createNestApplication();
+    app.setGlobalPrefix('api');
+    await app.init();
+  }, 30000);
+
+  afterAll(async () => {
+    if (app) await app.close();
+  });
+
+  it('GET /api/healthz returns db ready', async () => {
+    const res = await request(app.getHttpServer()).get('/api/healthz');
+    expect(res.status).toBe(200);
+    expect(res.body.ok).toBe(true);
+    expect(res.body.database).toBe('ready');
+  });
+});