chore: configure angular and postgres foundation

apps/api/src/config/database.config.ts

@@ -0,0 +1,16 @@
+import { TypeOrmModuleOptions } from '@nestjs/typeorm';
+
+export function createDatabaseConfig(
+  databaseUrl: string,
+): TypeOrmModuleOptions {
+  if (!databaseUrl.trim()) {
+    throw new Error('DATABASE_URL is required');
+  }
+
+  return {
+    type: 'postgres',
+    url: databaseUrl,
+    autoLoadEntities: true,
+    synchronize: false,
+  };
+}