fix: add production domain to CORS and update environment

- Add https://litter.psbailey.uk to CORS allowed origins
- Update CORS_ORIGIN in .env to production domain
- Update FRONTEND_URL for email links
- Support both http and https for the domain

Backend needs to be restarted after pulling this change.

server/src/index.ts

@@ -26,6 +26,8 @@ app.use(cors({
   origin: [
     'http://localhost:5173',
     'http://localhost:5174',
+    'https://litter.psbailey.uk',
+    'http://litter.psbailey.uk',
     process.env.CORS_ORIGIN || ''
   ].filter(Boolean),
   credentials: true,