feat(database): add Relais table to initialization script

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/src/config/typeorm.config.ts

@@ -0,0 +1,15 @@
+import { DataSource } from 'typeorm';
+import { config } from 'dotenv';
+
+config();
+
+export default new DataSource({
+  type: 'postgres',
+  host: process.env.DATABASE_HOST,
+  port: parseInt(process.env.DATABASE_PORT || '5432', 10),
+  username: process.env.DATABASE_USERNAME,
+  password: process.env.DATABASE_PASSWORD,
+  database: process.env.DATABASE_NAME,
+  entities: ['src/**/*.entity.ts'],
+  migrations: ['src/migrations/*.ts'],
+});