fix(conversation): disable synchronize in production

Use init-db.sql for schema management instead of TypeORM auto-sync.
synchronize:true is dangerous in production and causes conflicts
when multiple services share tables.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/services/conversation-service/src/app.module.ts

@@ -25,8 +25,8 @@ import { HealthModule } from './health/health.module';
         password: configService.get('POSTGRES_PASSWORD'),
         database: configService.get('POSTGRES_DB', 'iconsulting'),
         entities: [__dirname + '/**/*.entity{.ts,.js}'],
-        // 自动同步数据库schema - 确保Entity与数据库100%一致
-        synchronize: true,
+        // 生产环境禁用synchronize，使用init-db.sql初始化schema
+        synchronize: false,
         logging: configService.get('NODE_ENV') === 'development',
       }),
     }),