feat(api): seed reference activities and enable CORS for the worker SPA

apps/api/test/cors.test.ts

@@ -0,0 +1,29 @@
+import { describe, it, expect } from 'vitest';
+import { createApp } from '../src/app';
+
+const ORIGIN = 'http://localhost:5173';
+
+describe('cors', () => {
+  it('answers a CORS preflight for the SPA origin', async () => {
+    const app = createApp();
+    const res = await app.request('/api/activities', {
+      method: 'OPTIONS',
+      headers: {
+        Origin: ORIGIN,
+        'Access-Control-Request-Method': 'GET',
+      },
+    });
+    expect(res.headers.get('access-control-allow-origin')).toBe(ORIGIN);
+    const allowMethods = res.headers.get('access-control-allow-methods') ?? '';
+    expect(allowMethods).toContain('GET');
+  });
+
+  it('exposes set-auth-token to the SPA origin', async () => {
+    const app = createApp();
+    const res = await app.request('/api/activities', {
+      headers: { Origin: ORIGIN },
+    });
+    const expose = (res.headers.get('access-control-expose-headers') ?? '').toLowerCase();
+    expect(expose).toContain('set-auth-token');
+  });
+});