Update test URLs to use Traefik on port 80

Changes:
- Remove port 3127 from test URLs
- Tests now access site via Traefik on standard HTTP port 80
- Guest login confirmed working via Traefik routing

Test Results:
✅ GuestLogin mutation succeeds with JWT token
✅ GetGraphs query succeeds with guest authorization
✅ Apollo Client state shows successful guest session

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: Matthew Valancy

tests/e2e/demo-guest-login.spec.ts

@@ -5,7 +5,7 @@ import { test, expect } from '@playwright/test';
  * This test runs against the actual deployed instance at graphdone-ai-01.chocolate-perch.ts.net:3127
  */
 
-const DEMO_URL = 'http://graphdone-ai-01.chocolate-perch.ts.net:3127';
+const DEMO_URL = 'http://graphdone-ai-01.chocolate-perch.ts.net';
 
 test.describe('Demo Server Guest Login', () => {
   test.beforeEach(async ({ page }) => {

tests/e2e/demo-guest-quick-test.spec.ts

@@ -4,7 +4,7 @@ import { test, expect, chromium } from '@playwright/test';
  * Quick test with fresh browser context to avoid caching issues
  */
 
-const DEMO_URL = 'http://graphdone-ai-01.chocolate-perch.ts.net:3127';
+const DEMO_URL = 'http://graphdone-ai-01.chocolate-perch.ts.net';
 
 test('quick cache-free guest login test', async () => {
   // Create a completely fresh browser instance