fix(gateway): load .env from monorepo root via dotenv (#108)

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

apps/gateway/src/main.ts

@@ -1,3 +1,10 @@
+import { config } from 'dotenv';
+import { resolve } from 'node:path';
+
+// Load .env from monorepo root (cwd is apps/gateway when run via pnpm filter)
+config({ path: resolve(process.cwd(), '../../.env') });
+config(); // Also load apps/gateway/.env if present (overrides)
+
 import './tracing.js';
 import 'reflect-metadata';
 import { NestFactory } from '@nestjs/core';